<?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>0185-1101</journal-id>
<journal-title><![CDATA[Revista mexicana de astronomía y astrofísica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. astron. astrofis]]></abbrev-journal-title>
<issn>0185-1101</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Astronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-11012020000100029</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2020.56.01.05</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The Jet/Counterjet Symmetry of the HH 212 Outflow]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lora]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Ramírez]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Space Telescope Science Institute  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Nucleares ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Radioastronomía y Astrofísica Teórica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade de São Paulo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>56</volume>
<numero>1</numero>
<fpage>29</fpage>
<lpage>38</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012020000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012020000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012020000100029&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We present Spitzer (IRAC) images and a VLT 2.1 &#956;m image of the HH 212 outow. We find that this outow has a strong symmetry, with jet/counterjet knot pairs with &#8710;x &lt; 1´´ position offsets. We deduce that the jet/counterjet knots are ejected with time differences &#8710;&#964;0 &#8776; 6 yr and velocity differences &#8710;&#964;0 &#8776; 2 km s-1. We also analyze the deviations of the knot positions perpendicular to the outow axis, and interpret them in terms of a binary orbital motion of the outow source. Through this model, we deduce a &#8776; 0:7 M&#664; mass for the outow source, and a separation of &#8776; 80 AU between the components of the binary (assuming equal masses for the two components). Finally, using the IRAC data and the VLT 2.1 &#956;m image we measure the proper motion velocities, obtaining values from 50 to 170 km s-1.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Presentamos imágenes del Spitzer (IRAC) y una imagen del VLT a 2.1 &#956;m del flujo HH 212. Encontramos que este flujo tiene una fuerte simetría, con pares de nudos en el chorro/contrachorro con diferencias de posición &#8710;x &lt; 1´´. Deducimos que los pares de nudos chorro/contrachorro son expulsados con diferencias de tiempo &#8710;&#964;0 &#8776; 6 yr y de velocidad &#8710;&#964;0 &#8776;2 km s-1. También analizamos las desviaciones de las posiciones de los nudos perpendiculares al eje del flujo, y las interpretamos como resultado de un movimiento binario orbital de la fuente. A través de este modelo, deducimos una masa de &#8776; 0:7 M&#664; para la fuente, y una separación de &#8776; 80 AU para la binaria (suponiendo masas iguales para sus dos componentes). Finalmente, usamos los datos de IRAC y la imagen del VLT a 2.1 &#956;m para medir las magnitudes de los movimientos propios, obteniendo valores de 50 a 170 km s-1.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Herbig-Haro objects]]></kwd>
<kwd lng="en"><![CDATA[ISM: individual objects: HH212]]></kwd>
<kwd lng="en"><![CDATA[ISM: jets and outows]]></kwd>
<kwd lng="en"><![CDATA[shock waves]]></kwd>
<kwd lng="en"><![CDATA[stars: formation]]></kwd>
<kwd lng="en"><![CDATA[stars: winds]]></kwd>
<kwd lng="en"><![CDATA[out- ows]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Anthony-Twarog]]></surname>
<given-names><![CDATA[B. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1982</year>
<volume>87</volume>
<page-range>1213</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Codella]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Cabrit]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Gueth]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2014</year>
<volume>568</volume>
<page-range>L5</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Correia]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Zinnecker]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Ridgway]]></surname>
<given-names><![CDATA[S. T.]]></given-names>
</name>
<name>
<surname><![CDATA[McCaughrean]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2009</year>
<volume>505</volume>
<page-range>673</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[C. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Berndsen]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[M. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Chrysostomou]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Hobson]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2000</year>
<volume>314</volume>
<page-range>241</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fitzpatrick]]></surname>
<given-names><![CDATA[E. L]]></given-names>
</name>
</person-group>
<source><![CDATA[PASP]]></source>
<year>1999</year>
<volume>111</volume>
<page-range>63</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Galván-Madrid]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Ávila]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[L. F.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2004</year>
<volume>40</volume>
<page-range>31</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[R. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2004</year>
<volume>40</volume>
<page-range>61</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gredel]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Reipurth]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>1994</year>
<volume>289</volume>
<page-range>L19</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kounkel]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Hartmann]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Loinard]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2017</year>
<volume>834</volume>
<page-range>A142</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[C.-F.]]></given-names>
</name>
<name>
<surname><![CDATA[Hirano]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[Q.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2015</year>
<volume>805</volume>
<page-range>186</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[C.-F]]></given-names>
</name>
<name>
<surname><![CDATA[Ho]]></surname>
<given-names><![CDATA[P. T. P]]></given-names>
</name>
<name>
<surname><![CDATA[Beuther]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2006</year>
<volume>639</volume>
<page-range>292</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[C.-F.]]></given-names>
</name>
<name>
<surname><![CDATA[Ho]]></surname>
<given-names><![CDATA[P. T. P]]></given-names>
</name>
<name>
<surname><![CDATA[Hirano]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2007</year>
<volume>659</volume>
<page-range>499</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[C.-F]]></given-names>
</name>
<name>
<surname><![CDATA[Ho]]></surname>
<given-names><![CDATA[P. T. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[Z.-Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[NatAs]]></source>
<year>2017</year>
<volume>1</volume>
<page-range>0152</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Leibundgut]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Hibon]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Kuntschner]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[Msngr]]></source>
<year>2018</year>
<volume>172</volume>
<page-range>8</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Looney]]></surname>
<given-names><![CDATA[L. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Tobin]]></surname>
<given-names><![CDATA[J. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kwon]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2007</year>
<volume>670</volume>
<page-range>131</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Masciadri]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2002</year>
<volume>568</volume>
<page-range>733</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Maret]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Bergin]]></surname>
<given-names><![CDATA[E. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Neufeld]]></surname>
<given-names><![CDATA[D. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2009</year>
<volume>698</volume>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Morris]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Marleau]]></surname>
<given-names><![CDATA[F. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJS]]></source>
<year>2004</year>
<volume>154</volume>
<page-range>352</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Moro-Martin]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Carey]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJS]]></source>
<year>2004</year>
<volume>154</volume>
<page-range>402</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Stapelfeldt]]></surname>
<given-names><![CDATA[K. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Carey]]></surname>
<given-names><![CDATA[S. J]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2011</year>
<volume>732</volume>
<page-range>L16</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2012</year>
<volume>750</volume>
<page-range>101</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Lora]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Stapelfeldt]]></surname>
<given-names><![CDATA[K. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Carey]]></surname>
<given-names><![CDATA[S. J]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2011</year>
<volume>730</volume>
<page-range>L17</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez-Ramírez]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2011</year>
<volume>47</volume>
<page-range>289</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2012</year>
<volume>748</volume>
<page-range>103</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Reipurth]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Esquivel]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2017</year>
<volume>53</volume>
<page-range>485</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Reipurth]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2019</year>
</nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reipurth]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[C. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Bally]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>2019</year>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[M. D.]]></given-names>
</name>
<name>
<surname><![CDATA[O&#8217;Connell]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[C. J]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2007</year>
<volume>466</volume>
<page-range>565</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tobin]]></surname>
<given-names><![CDATA[J. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Looney]]></surname>
<given-names><![CDATA[L. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Mundy]]></surname>
<given-names><![CDATA[L. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Kwon]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Hamidouche]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2007</year>
<volume>659</volume>
<page-range>1404</page-range></nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ybarra]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Lada]]></surname>
<given-names><![CDATA[E. A]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2009</year>
<volume>695</volume>
<page-range>120</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zinnecker]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Bastien]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Arcoragi]]></surname>
<given-names><![CDATA[J.-P.]]></given-names>
</name>
<name>
<surname><![CDATA[Yorke]]></surname>
<given-names><![CDATA[H. W.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>1992</year>
<volume>265</volume>
<page-range>726</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zinnecker]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[McCaughrean]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Rayner]]></surname>
<given-names><![CDATA[J. T]]></given-names>
</name>
</person-group>
<source><![CDATA[Natur]]></source>
<year>1998</year>
<volume>394</volume>
<page-range>862</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
