<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1870-3542</journal-id>
<journal-title><![CDATA[Revista mexicana de física E]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fís. E]]></abbrev-journal-title>
<issn>1870-3542</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-35422013000200008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[En busca de los efectos gravitacionales de Birkhoff: la ultracentrífuga transelástica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galindo]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrera]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes-Cota]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Investigaciones Nucleares Departamento de Física ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Investigaciones Nucleares Departamento de Sistemas Electrónicos ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<volume>59</volume>
<numero>2</numero>
<fpage>101</fpage>
<lpage>114</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-35422013000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-35422013000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-35422013000200008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Este artículo examina el origen, desarrollo, culminación y desenlace del proyecto de la ultracentrífuga transelástica del Centro Nuclear de México ocurridos entre 1971 y 1986. El proyecto tuvo su origen en la búsqueda de un efecto que supuestamente comprobaría la teoría de gravitación de Birkhoff sobre la Relatividad General de Einstein. Para este propósito se diseñó y construyó una extraordinaria ultracentrífuga que mereció el Premio Nacional de Instrumentación (México) 1973. La ultracentrífuga también fue usada para investigar la factibilidad de enriquecer uranio por centrifugación en estado sólido. Se obtuvo uranio altamente enriquecido, aunque en pequeñas cantidades.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[This work reviews the origin, development, completion, and outcome of a trans-elastic ultracentrifuge project of Mexico's Nuclear Center through 1971 to 1986. The project had its origin in the search for an effect that supposedly would validate Birkhoff's gravity theory over Einstein's General Relativity. For this purpose an extraordinary ultracentrifuge was built which deserved the 1973 National Award for Instruments (Mexico). The ultracentrifuge was also used to investigate the feasibility of uranium enrichment by solid state centrifugation. Highly enriched uranium was obtained, but in small quantities.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Birkhoff]]></kwd>
<kwd lng="es"><![CDATA[separación isótopos]]></kwd>
<kwd lng="es"><![CDATA[ultracentrífugas]]></kwd>
<kwd lng="es"><![CDATA[teorías gravitacionales en espacio plano]]></kwd>
<kwd lng="en"><![CDATA[Birkhoff]]></kwd>
<kwd lng="en"><![CDATA[isotope separation]]></kwd>
<kwd lng="en"><![CDATA[ultracentrifuges]]></kwd>
<kwd lng="en"><![CDATA[flat space gravitational theories]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Historia y filosof&iacute;a de la f&iacute;sica</font></p>          <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="4"><b>En busca de los efectos gravitacionales de Birkhoff: la ultracentr&iacute;fuga transel&aacute;stica</b></font></p>              <p align="center"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="2"><b>S. Galindo<sup>a</sup>, C. Cabrera<sup>b</sup> y J. L. Cervantes&#45;Cota<sup>a</sup></b></font></p>              <p align="center"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><i><sup>a</sup> Departamento de F&iacute;sica. </i></font></p>              <p align="justify"><font face="verdana" size="2"><i> <sup>b</sup> Departamento de Sistemas Electr&oacute;nicos Instituto Nacional de Investigaciones Nucleares, Km. 36.5 Carretera M&eacute;xico&#45; Toluca 52045, M&eacute;xico,</i> e&#45;mail: <a href="mailto:salvador.galindo@inin.gob.mx">salvador.galindo@inin.gob.mx</a>.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Received 27 February 2013     <br>     Accepted 30 July 2013</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>              <p align="justify"><font face="verdana" size="2">Este art&iacute;culo examina el origen, desarrollo, culminaci&oacute;n y desenlace del proyecto de la ultracentr&iacute;fuga transel&aacute;stica del Centro Nuclear de M&eacute;xico ocurridos entre 1971 y 1986. El proyecto tuvo su origen en la b&uacute;squeda de un efecto que supuestamente comprobar&iacute;a la teor&iacute;a de gravitaci&oacute;n de Birkhoff sobre la Relatividad General de Einstein. Para este prop&oacute;sito se dise&ntilde;&oacute; y construy&oacute; una extraordinaria ultracentr&iacute;fuga que mereci&oacute; el Premio Nacional de Instrumentaci&oacute;n (M&eacute;xico) 1973. La ultracentr&iacute;fuga tambi&eacute;an fue usada para investigar la factibilidad de enriquecer uranio por centrifugaci&oacute;n en estado s&oacute;lido. Se obtuvo uranio altamente enriquecido, aunque en peque&ntilde;as cantidades.</font></p>              <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Birkhoff; separaci&oacute;n is&oacute;topos; ultracentr&iacute;fugas; teor&iacute;as gravitacionales en espacio plano.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>              <p align="justify"><font face="verdana" size="2">This work reviews the origin, development, completion, and outcome of a trans&#45;elastic ultracentrifuge project of Mexico's Nuclear Center through 1971 to 1986. The project had its origin in the search for an effect that supposedly would validate Birkhoff's gravity theory over Einstein's General Relativity. For this purpose an extraordinary ultracentrifuge was built which deserved the 1973 National Award for Instruments (Mexico). The ultracentrifuge was also used to investigate the feasibility of uranium enrichment by solid state centrifugation. Highly enriched uranium was obtained, but in small quantities.</font></p>              <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Birkhoff; isotope separation; ultracentrifuges; flat space gravitational theories.</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 01.65.+g; 04.80.Cc; 28.60.+s</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmfe/v59n2/v59n2a8.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">1. J. M. Lozano Mej&iacute;a, <i>Bol. Soc. Mex. Fis.</i> <b>5</b> (1991) 95.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460434&pid=S1870-3542201300020000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <p align="justify"><font face="verdana" size="2">2. En la categor&iacute;a de desarrollo de Instrumentos la lista de laureados fue: James Clark Keith, Roberto Jim&eacute;nez Ornelas, Jaime Morales Sandoval, Ofelia Canales del Olmo y Carlos Cabrera Cruz. Recibieron una menci&oacute;n como colaboradores: Roberto Andrade Mu&ntilde;oz, Edgar Quiroz Miranda, Jaime Ju&aacute;rez Jimenez, Manuel Rodr&iacute;guez Uribe, Humberto Rivera Meza, Jose D' Oporto Zavala, Adriano Di Luca y Leopoldo Nieto Casas.</font></p>              <p align="justify"><font face="verdana" size="2">3. <i>"In the field of world policy I would dedicate this Nation to the policy of the good neighbor the neighbor who resolutely respects himself and, because he does so, respects the rights of others the neighbor who respects his obligations and respects the sanctity of his agreements in and with a world of neighbors".</i> Franklin D. Roosevelt, First Inaugural Address, 4 de marzo (1933).</font></p>              <p align="justify"><font face="verdana" size="2">4. <i>"... the right of the United States to intervene in Latin America in cases of flagrant and chronic wrongdoing by a Latin American Nation"</i> Theodore Roosevelt, State of the Union Address, 6 de diciembre (1904).</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">5. En el caso de M&eacute;xico esto se tradujo, entre otras cosas, en el reconocimiento en 1941 por parte de los Estados Unidos, del derecho soberano de M&eacute;xico sobre sus riquezas petroleras, terminando as&iacute; el conflicto entre ambas naciones surgido por la expropiaci&oacute;n petrolera de 1936.</font></p>              <p align="justify"><font face="verdana" size="2">6. The Office of Coordinator of Inter&#45;American Affairs fue establecida por Executive Order No. 8840, de Julio 30, 1941. A partir del fin de la guerra tomo el nombre de Office of Inter&#45;American Affairs (OIAA).</font></p>              <p align="justify"><font face="verdana" size="2">7. Manuel Sandoval Vallarta y Alfonso N&aacute;poles G&aacute;ndara fueron dos excepciones ya que fueron becados en 1927 y 1931 respectivamente. Entre los primeros f&iacute;sicos y matem&aacute;ticos mexicanos beneficiados con las becas que la fundaci&oacute;n John Simon Gugen&#45;hein otorg&oacute; dentro de su programa de becas a latinoamericanos podemos mencionar a: Alfredo Barios (1935,1936,1937,1957), Carlos Graef Fern&aacute;ndez.(1937,1938,1939), Nabor Carrillo Flores (1940,1941), Jaime LIfshitz Gaj (1942,1943), Alberto Barajas Celis (1944), Guido Munch Paniagua (1944,1945,1958), Paris Pishmish (1946), Jos&eacute; Adem Chaim (1951,1952), Samuel Barocio Barrios (1956).</font></p>              <p align="justify"><font face="verdana" size="2">8. Exist&iacute;a y funcionaba en aquel tiempo el Observatorio Astron&oacute;mico de Tacubaya cuya labor principal estaba enfocada a la astronom&iacute;a y no a la astrof&iacute;sica.</font></p>              <p align="justify"><font face="verdana" size="2">9. Las partes mec&aacute;nicas del telescopio fueron construidas en los talleres de la Universidad de Harvard.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">10. P. Pismis, "El <i>amanecer de la astrof&iacute;sica en M&eacute;xico"</i> en Historia de la Astronom&iacute;a en Mexico, varios autores (M.A. Moreno compilador) colecci&oacute;n la Ciencia desde M&eacute;xico F.C.E. (1986)</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460444&pid=S1870-3542201300020000800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">11. P. <i>"Testimonios de la Ciencia, Educaci&oacute;n Cultura y Comunicaci&oacute;n II La F&iacute;sica"</i> , en Setenta y cinco a&ntilde;os de Revoluci&oacute;n, Fondo de Cultura Econ&oacute;mica, M&eacute;xico, <b>V</b> (1988) p. 757.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460445&pid=S1870-3542201300020000800003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>          <!-- ref --><p align="justify"><font face="verdana" size="2">12. B. J. Bok, <i>"Astronom&iacute;a Mexicana 1930&#45;1950"</i> en Historia de la Astronom&iacute;a en M&eacute;xico, varios autores (M.A. Moreno compilador) colecci&oacute;n la Ciencia desde M&eacute;xico F.C.E. (1986) ver tambien,    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460447&pid=S1870-3542201300020000800004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --> B. J. Bok <i>Rev. MexA.A.</i> <b>17</b> (1986) 21.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460448&pid=S1870-3542201300020000800005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">13. L J Butler, <i>American National Biography</i> <b>2</b> (Oxford, 1999) 813-814.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460450&pid=S1870-3542201300020000800006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">14. Carta de Garc&iacute;a a Birkhoff, Julio 20, 1939. Citada por Eduardo L. Ortiz en la <i>Revista Saber y Tiempo</i> <b>4</b> (2003) 53,    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460452&pid=S1870-3542201300020000800007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> "La pol&iacute;tica interamericana de Roosevelt: George D. Birkhoff y la inclusi&oacute;n de Am&eacute;rica Latina en las redes matem&aacute;ticas internacionales (Primera Parte)", Cf. nota 23 p. 104.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">15. <sup>15</sup>G.D. Birkhoff, <i>Bol. Soc. Mat. Mex.</i> <b>1</b> (1944) 1.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460454&pid=S1870-3542201300020000800008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <p align="justify"><font face="verdana" size="2">16. Referencia 11, p. 757.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">17. G.D. Birkhoff, <i>Proc. Nat. Acad. Sc.</i> <b>29</b> (1943) 231.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460457&pid=S1870-3542201300020000800009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">18. <i>"The perfect fluid is singled out by the further requirement that the disturbance velocity is to be that of light at all densities, with the corresponding equation of state, p = p/2, p and p = f(p) designate, respectively, the density and pressure of the fluid"</i></font></p>              <p align="justify"><font face="verdana" size="2">19 . <i>"Matter is supposed to be either that special, mathematically satisfactory, homogeneous adiabatic fluid for which p = p/2 or, presumably, anyform ofmatter in which the disturbance velo&#45;cityis that oflight under all circumstances."</i></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">20. Ver C. M. Will <i>Sci. Am.</i> <b>231</b> (1974) 4.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460461&pid=S1870-3542201300020000800010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">21. H. Weyl, <i>Mathematical Reviews</i> <b>4</b> (1943) 285.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460463&pid=S1870-3542201300020000800011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">22. A. Barajas <i>Proc. Nat. Acad. Sc.</i> <b>30</b> (1944) 54.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460465&pid=S1870-3542201300020000800012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">23. H. Weyl, <i>Proc. Nat. Acad. Sc.</i> <b>30</b> (1944) 205.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460467&pid=S1870-3542201300020000800013&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">24. "Any <i>theory which breaks up the unity of inertia and gravitation, as Birkhoff's recent theory of gravitation in a "flat world" does, throws us back into the position before Einstein where we had to accept the identity of mass and weight without understanding it."</i></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">25. A. Barajas, G. D. Birkhoff, C. Graef, M. Sandoval Vallarta, <i>Phys. Rev.</i> <b>66</b> (1944) 138.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460470&pid=S1870-3542201300020000800014&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">26. C. Graef, <i>Bol. Soc. Mat. Mex.</i> <b>1</b> (1944) 30.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460472&pid=S1870-3542201300020000800015&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">27. G.D. Birkhoff, <i>Proc. Nat. Acad. Sc.</i> <b>30</b> (1944) 324.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460474&pid=S1870-3542201300020000800016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">28. M. Moshinsky, <i>Phys. Rev.</i> <b>80</b> (1950) 514.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460476&pid=S1870-3542201300020000800017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">29. F. Alba Andrade, <i>Rev. Mex. Fis.</i> <b>1</b> (1952) 38.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460478&pid=S1870-3542201300020000800018&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <p align="justify"><font face="verdana" size="2">30. Adem&aacute;s varios estudiantes realizaron tesis bajo la direcci&oacute;n de Graef a dem&aacute;s de otros colegas sobre campos gravitacionales de cuerpos en rotaci&oacute;n y chocando el&aacute;sticamente basados en la teor&iacute;a de Birkhoff, entre ellos: Ram&oacute;n Mart&iacute;nez Maldonado, Guillermo Aguilar Sahagun, Valent&iacute;n Cardona, Ferm&iacute;n Viniegra, Octavio Obreg&oacute;n y Carlos Latorre.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">31. M. Sandoval Vallarta, <i>Bol. Soc. Mat. Mex.</i> <b>1</b> (4 y 5) (1944) 47,    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460481&pid=S1870-3542201300020000800019&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> reproducido en Ciencia (M&eacute;xico) <b>VI</b> (1944) 9.</font></p>              <p align="justify"><font face="verdana" size="2">32. P&aacute;gina 47 referencia 29</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">33. <i>"Carlos Graef Fern&aacute;ndez: Obra Cient&iacute;fica'"</i> J. L. Fern&aacute;ndez Chapou y A. Mondrag&aacute;n Ballesteros, Compiladores. UAM, M&eacute;xico (1990).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460484&pid=S1870-3542201300020000800020&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --> Una lista aparentemente completa de los art&iacute;culos publicados sobre gravitaci&oacute;n y relatividad en el M&eacute;xico moderno aparece publicada en C. Ledezma Ort&iacute;z <i>Bol. Soc. Mex. Fis</i> <b>5</b> (1991)97.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460485&pid=S1870-3542201300020000800021&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">34. <i>"Contra corriente: Historia de la Energ&iacute;a Nuclear en M&eacute;xico (1945&#45;1995)"</i> L. F. Azuela y J. L. Talancon Plaza &amp; Valdez, M&eacute;xico (1999)</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460487&pid=S1870-3542201300020000800022&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">35. <i>"Los principios y las instituciones relativas al derecho de la energ&iacute;a nuclear. La pol&iacute;tica nuclear</i> A. Francoz Rigalt" p.93. M&eacute;xico, UNAM (1988) ISBN 968&#45;837&#45;866&#45;6</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460488&pid=S1870-3542201300020000800023&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">36. Memoria de labores 1968&#45;1969 p 11. Centro de documentaci&oacute;n ININ. Archivo de informaci&oacute;n doc. 8 (1969) <i>Rev.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460489&pid=S1870-3542201300020000800024&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --> Mex. Fis. E</i> <b>59</b> (2013) 101&#45;114</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460490&pid=S1870-3542201300020000800025&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">37. Keith J.C. <i>"Gravitational Radiation in flat space&#45;time relativity"</i> Interim report 1g.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460491&pid=S1870-3542201300020000800026&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> University of Detroit. Contract No. DA&#45;44&#45;17&#45;TC&#45;519. April 30 (1959). Technical supervision USA TRECOM (Transport Reseach Command).</font></p>              <p align="justify"><font face="verdana" size="2">38. "&#91;El proyecto ERG&#93; <i>inspirado por el Dr. Carlos Graef Fernandez y el Dr. Jesse W. Beams, llevado a cabo en la Universidad de Detroit, Michigan"</i> "La Ultracentr&iacute;fuga Transelastica" reporte sometido a la consideraci&oacute;n de la Academia de Investigacion Cient&iacute;fica A.C., en ocasion del Concurso Nacional de Instrumentation para la Investigation. Enero de 1974, p. 1 Introduction.</font></p>              <p align="justify"><font face="verdana" size="2">39. Struik fue gran amigo del matem&aacute;tico mexicano Alfonso Napoles G&aacute;ndara, este &uacute;ltimo ex becario Gugenheim en MIT durante el per&iacute;odo 1931. Struik realiz&oacute; una visita acad&eacute;mica a M&eacute;xico por invitaci&oacute;n de N&aacute;poles G&aacute;ndara en 1934 donde dict&oacute; una serie de conferencias matem&aacute;ticas. La presencia de Struik en M&eacute;xico pudo ser un factor que anim&oacute; a Keith a m&aacute;s tarde radicar por algunos a&ntilde;os en M&eacute;xico y dirigir el proyecto de ultra centrifugas. Cabe tambi&eacute;n destacar que Graef Fernand&eacute;z y Alberto Barajas fueron disc&iacute;pulos de N&aacute;poles G&aacute;ndara.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">40. J. C. Keith "On <i>Birkhoff's theory of matter and force in Minkowski space&#45;time"</i> (B.Sc. thesis MIT, 1957).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460495&pid=S1870-3542201300020000800027&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">41. J.C. Keith, <i>Rev. Mex. Fis.</i> <b>12</b> (1963) 1.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460497&pid=S1870-3542201300020000800028&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">42. J. C. Keith, <i>J. Res. Nat. Bur. Stand.</i> <b>67D</b> (1963) 533.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460499&pid=S1870-3542201300020000800029&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">43. J. R Killian, Jr, <i>"Sputnik, Scientist and Eisenhower".</i> (MIT Press1977) Cap. 1 Sputnik and its Shock Waves.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460501&pid=S1870-3542201300020000800030&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">44. J. Ellen Abbate, <i>"From ARPANET to Internet: A history of ARPA&#45;sponsored computer networks, 1966&#45;1988"</i> (January 1, 1994).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460503&pid=S1870-3542201300020000800031&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> <i>Dissertations available from ProQuest.</i> Paper AAI9503730.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">45. Cabe recordar que en aquellos a&ntilde;os estaba en discusi&oacute;n el control de la gravitation. Ver por ejemplo "Guidelines to Anti&#45;gravity" por R.L. Forward Am. J. Phys. <b>31</b>(3) (1963) 166.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460505&pid=S1870-3542201300020000800032&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> Este trabajo obtuvo el Segundo lugar en 1962, en el concurso anual organizado por la Gravity Research Foundation (<a href="http://www.gravityresearchfoundation.org/" target="_blank">http://www.gravityresearchfoundation.org/</a>)</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">46. H. A Laitinen, <i>Anal. Chem.</i> <b>42</b> (1970) 689.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460507&pid=S1870-3542201300020000800033&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">47. Como becario de la Comision Nacional de Energ&iacute;a Nuclear de M&eacute;xico. (beca 504.111/198).</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">48. J.C. Clark. Reporte especial para la Coordination General del INEN, <i>"Proyectos realizados, actuales y futuros"</i> (2 mayo 1977).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460510&pid=S1870-3542201300020000800034&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">49. F.A. Lindemann y F.W. Aston, <i>Phil. Mag.</i> <b>37</b> (1919) 523.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460512&pid=S1870-3542201300020000800035&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">50. J.W. Beams y F.B. Haynes, <i>Phys. Rev.</i> <b>50</b> (1936) 491.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460514&pid=S1870-3542201300020000800036&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">51. R. Scott Kemp "Gas <i>centrifuge theory and development: a review of U. S. programs"</i> en Science and Security <b>17</b> (2009) 1. <i>DOI: 10.1080/08929880802335816</i></font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460516&pid=S1870-3542201300020000800037&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">52. N. Gall, <i>Bull. Atom. Scien.</i> <b>32</b> (1976) 4.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460517&pid=S1870-3542201300020000800038&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">53. F.T. Holmes, <i>Rev. Sci. Instr.</i> <b>8</b> (1937) 444.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460519&pid=S1870-3542201300020000800039&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">54. F.T. Holmes y J.W. Beams, <i>Nature</i> <b>140</b> (1937) 30.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460521&pid=S1870-3542201300020000800040&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">55. Por ejemplo Beams reporto que "un <i>rotor girando rapidamente perdera varias revoluciones por segundo si una puerta es azotada en un cuarto contiguo. ". ..a rapidly spinning rotor will lose several rps if a door is slammed in the next room".</i> J.W. Beams, D.M.Spitzer Jr., and J.P. Wade Jr., <i>Rev. Sci. Instrum.</i> <b>33</b> (1962) 151.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460523&pid=S1870-3542201300020000800041&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <p align="justify"><font face="verdana" size="2">56. Como ya lo mencionamos, el programa ERG de la Universidad de Detroit seg&uacute;n testimonio del propio Jimmy, fue inspirado por Carlos Graef y Jesse W. Beams. Ref. 38.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">57. T. Mashimo etal., "J. <i>Nuc. Sc. and Tech. Suppl.</i> <b>6</b> (2008) 105.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460526&pid=S1870-3542201300020000800042&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">58. J.K. Fremerey <i>Rev. Sci. Inst.</i> <b>42</b> (1971) 753,    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460528&pid=S1870-3542201300020000800043&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <p align="justify"><font face="verdana" size="2">59. Fremerey trabaj&oacute; desde 1963 &#45;1974 en el laboratorio de ultra&#45;centr&iacute;fugas de gas con Wilhelm Groth, personaje al cual ya nos referimos en relaci&oacute;n a la venta de estos instrumentos al Brasil.</font></p>              <p align="justify"><font face="verdana" size="2">60. " <i>The reliability must be increased up to the weekend stability in order to be able to look for a gravitational effect, which should appear according to Keith's theoretical considerations".</i> Fremerey (1971) op. cit. ref 53, p. 762.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">61. "La <i>Ultracentr&iacute;fuga Solida y su Aplicacion en la Separacion de Isotopos de Uranio: Memorias"</i> 10 de junio de 1982 ININ.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460532&pid=S1870-3542201300020000800044&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <p align="justify"><font face="verdana" size="2">62. Ver nota 2.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">63. J.K. Fremerey, <i>Phys. Rev. Lett.</i> <b>30</b> (1973) 753.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460535&pid=S1870-3542201300020000800045&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">64. M Reinhardt and A. Rosenblum, <i>Lett. Nuovo Cimento</i> <b>6</b> (1973) 189.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460537&pid=S1870-3542201300020000800046&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">65. Cf. Ec. 1, donde k = 75&#960;/128 para un rotor esferico, <i>a</i> =10 km el radio de giro del pulsar, T= (2<i>&#960;&#969;</i>)<sup>&#45;1</sup> = 33 ms el per&iacute;odo observado de giro del pulsar y c = 3 &times; 10<sup>5</sup> km s<sup>&#45;1</sup> la velocidad de la luz.</font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">66. E. Frehland, <i>Lett. Nuovo Cimento</i> <b>7</b> (1973) 490.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460540&pid=S1870-3542201300020000800047&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">67. Para una explicaci&oacute;n detallada del fen&oacute;meno ver por ejemplo, J.M. Wiesberg, J. H. Taylor y L. A. Fowler, <i>Sci. Am.</i> <b>245</b> (O.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460542&pid=S1870-3542201300020000800048&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --> J. Obregon D&iacute;az, "El <i>nacimiento de la Relatividad y la Gravitacion en M&eacute;xico"</i> en "La relatividad en M&eacute;xico Ma. P. Ramos Lara ed. (2008) UNAM ISBN 978&#45;970&#45;32&#45;4608&#45;3</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460543&pid=S1870-3542201300020000800049&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">68. J.C. Keith, M. I. Mora, O. Olea y J.L. Pe&ntilde;a <i>Springer Series in Chemical Physics</i> <b>44</b> (1986) 409.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460544&pid=S1870-3542201300020000800051&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref -->    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460545&pid=S1870-3542201300020000800050&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">69. J.C. Keith, O. Olea y J.L. Pe&ntilde;a, <i>Proceedings of the 10th International Vacuum Congress (IVC&#45;10), 6th International Conference on Solid Surfaces (ICSS&#45;6) and 33rd National Symposium ofthe American Vacuum Society.</i> October 27&#45;31, (1986). Baltimore, Maryland USA ISBN 0734&#45;2101</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460547&pid=S1870-3542201300020000800052&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">70. O. Olea, <i>"Difusion forzada de elementos pesados en solidos girados a altas velocidades soportados magne&iacute;ticamente"</i> Reporte Interno, invierno (1986). Centro de Informaci&oacute;n y Documentacion Nuclear (ININ) Documento No. Olea 5557_1624.pdf, p12.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8460548&pid=S1870-3542201300020000800053&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>       ]]></body><back>
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