<?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>1405-5546</journal-id>
<journal-title><![CDATA[Computación y Sistemas]]></journal-title>
<abbrev-journal-title><![CDATA[Comp. y Sist.]]></abbrev-journal-title>
<issn>1405-5546</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Centro de Investigación en Computación]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-55462007000100004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Cognitive Maps: an Overview and their Application for Student Modeling]]></article-title>
<article-title xml:lang="es"><![CDATA[Mapas Cognitivos: un Perfil y su Aplicación al Modelado del Estudiante]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sossa]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[Agustin]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional UPIICSA2 ]]></institution>
<addr-line><![CDATA[México, D. F ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2007</year>
</pub-date>
<volume>10</volume>
<numero>3</numero>
<fpage>230</fpage>
<lpage>250</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-55462007000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-55462007000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-55462007000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this paper we state how Cognitive Maps can be used to model causal phenomena. In addition, we show the application of the Cognitive Maps to the field of the Student Modeling. Conceptually speaking, Cognitive Maps set and simulate the systems dynamics based upon qualitative knowledge. A Cognitive Map is a tool that gives away the entities of the issue of study. Moreover, Cognitive Maps bring out the causal phenomena as cause-effect relationships between concepts. According to the relationships, a topology and a workflow of causal effects is designed. Cognitive Maps aim to predict the evolution of a model through simulation. During the process are achieved causal inferences that estimate the variation on the state of the concepts. The simulation breaks down when the concept values reach a fixed point, a pattern of states or a chaotic region in the search space. Wherefore, in this paper we depict the underlying concepts for Causal Modeling by means of Cognitive Maps. In addition, three versions of Cognitive Maps are outlined. Besides to reveal their mathematical baseline, we illustrate their application through the development of a case of study focus on Student Model.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este artículo se establece como usar los Mapas Cognitivos para modelar fenómenos causales. Además, mostramos su aplicación en el Modelado del Estudiante. Conceptualmente hablando, los Mapas Cognitivos definen y simulan la dinámica de sistemas por medio de conocimiento cualitativo. Un Mapa Cognitivo es una herramienta que revela las entidades del objeto de estudio. Así mismo, los Mapas Cognitivos expresan el fenómeno causal como relaciones causa-efecto entre conceptos. De acuerdo con las relaciones, una topología y un flujo de efectos causales es diseñada. Los Mapas Cognitivos buscan predecir la evolución del modelo mediante simulación. Durante el proceso se realizan inferencias que estiman la variación del estado de los conceptos. La simulación termina cuando los valores de los conceptos arriban a punto fijo, a un patrón de estados, o a una región de caos en el espacio de búsqueda. Por tanto, en este artículo se definen los conceptos base para el modelado causal a través de Mapas Cognitivos. También se presentan tres versiones de Mapas Cognitivos. Además se expresa la base matemática y se ilustra su aplicación en el desarrollo de un Modelo del Estudiante.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cognitive Maps]]></kwd>
<kwd lng="en"><![CDATA[Causal-effect relationships]]></kwd>
<kwd lng="en"><![CDATA[Concepts]]></kwd>
<kwd lng="en"><![CDATA[Causal inference]]></kwd>
<kwd lng="en"><![CDATA[Student Model]]></kwd>
<kwd lng="es"><![CDATA[Mapas Cognitivos]]></kwd>
<kwd lng="es"><![CDATA[Relaciones Causales]]></kwd>
<kwd lng="es"><![CDATA[Conceptos]]></kwd>
<kwd lng="es"><![CDATA[Inferencia Causal]]></kwd>
<kwd lng="es"><![CDATA[Modelo del Estudiante]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culos</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Cognitive Maps: an Overview and their Application for Student Modeling</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><i>Mapas Cognitivos: un Perfil y su Aplicaci&oacute;n al Modelado del Estudiante</i></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Alejandro Pe&ntilde;a<sup>1,2,3</sup>, Humberto Sossa<sup>3</sup> and Agustin Guti&eacute;rrez<sup>3</sup></b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><i>WOLNM<sup>1</sup>, UPIICSA<sup>2</sup> &amp; CIC<sup>3</sup> &#150; National Polytechnic Institute<sup>2,3    <br>   </sup>Pattern Recognition Laboratory<sup>2,3    ]]></body>
<body><![CDATA[<br>   </sup>31 Julio 1859, # 1099&#150;B, Leyes Reforma, 09310,    <br>   Ciudad de M&eacute;xico, D. F, M&eacute;xico    <br>   +52&#150;55&#150;5694&#150;0916</i></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><a href="mailto:apenaa@ipn.mx">apenaa@ipn.mx,</a>   <a href="mailto:hsossa@cic.ipn.mx">hsossa@cic.ipn.mx,</a>   <a href="mailto:atornes@cic.ipn.mx">atornes@cic.ipn.mx</a></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><u>Article received on April 18, 2006; accepted on January 08, 2007</u></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">In this paper we state how Cognitive Maps can be used to model causal phenomena. In addition, we show the application of the Cognitive Maps to the field of the Student Modeling. Conceptually speaking, Cognitive Maps set and simulate the systems dynamics based upon qualitative knowledge. A Cognitive Map is a tool that gives away the entities of the issue of study. Moreover, Cognitive Maps bring out the causal phenomena as cause&#150;effect relationships between concepts. According to the relationships, a topology and a workflow of causal effects is designed. Cognitive Maps aim to predict the evolution of a model through simulation. During the process are achieved causal inferences that estimate the variation on the state of the concepts. The simulation breaks down when the concept values reach a fixed point, a pattern of states or a chaotic region in the search space. Wherefore, in this paper we depict the underlying concepts for Causal Modeling by means of Cognitive Maps. In addition, three versions of Cognitive Maps are outlined. Besides to reveal their mathematical baseline, we illustrate their application through the development of a case of study focus on Student Model.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Cognitive Maps, Causal&#150;effect relationships, Concepts, Causal inference, and Student Model.</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">En este art&iacute;culo se establece como usar los Mapas Cognitivos para modelar fen&oacute;menos causales. Adem&aacute;s, mostramos su aplicaci&oacute;n en el Modelado del Estudiante. Conceptualmente hablando, los Mapas Cognitivos definen y simulan la din&aacute;mica de sistemas por medio de conocimiento cualitativo. Un Mapa Cognitivo es una herramienta que revela las entidades del objeto de estudio. As&iacute; mismo, los Mapas Cognitivos expresan el fen&oacute;meno causal como relaciones causa&#150;efecto entre conceptos. De acuerdo con las relaciones, una topolog&iacute;a y un flujo de efectos causales es dise&ntilde;ada. Los Mapas Cognitivos buscan predecir la evoluci&oacute;n del modelo mediante simulaci&oacute;n. Durante el proceso se realizan inferencias que estiman la variaci&oacute;n del estado de los conceptos. La simulaci&oacute;n termina cuando los valores de los conceptos arriban a punto fijo, a un patr&oacute;n de estados, o a una regi&oacute;n de caos en el espacio de b&uacute;squeda. Por tanto, en este art&iacute;culo se definen los conceptos base para el modelado causal a trav&eacute;s de Mapas Cognitivos. Tambi&eacute;n se presentan tres versiones de Mapas Cognitivos. Adem&aacute;s se expresa la base matem&aacute;tica y se ilustra su aplicaci&oacute;n en el desarrollo de un Modelo del Estudiante.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Mapas Cognitivos, Relaciones Causales, Conceptos, Inferencia Causal, y Modelo del Estudiante.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/cys/v10n3/v10n3a4.pdf" target="_blank">DESCARGA 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>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">First author states that this work was inspired in a special way for his Father, his brother Jesus and his Helper as part of the projects of World Outreach Light to the Nations Ministries (WOLNM). Also this work was supported by grants: CONACYT&#150;SEP C0146805/747, CONACYT 182329, COFAA DEBEC/651/2006, COTEPABE PL&#150;22&#150;07 and Microsoft Mexico.</font></p>     ]]></body>
<body><![CDATA[<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. <b>Axelrod, R.</b>, <i>Structure of Decision: The Cognitive Maps of Political Elites. </i>Princeton, 1976.</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=2042225&pid=S1405-5546200700010000400001&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">2. <b>Aguilar, J., </b><i>A Survey about Fuzzy Cognitive Maps Papers. </i>Int. J. of Computational Cognition, V. 3, No. 2, June, 2003.</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=2042226&pid=S1405-5546200700010000400002&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">3. <b>Aguilar, J., </b><i>Dynamic Random Fuzzy Cognitive Maps. </i>Iberoameric J. of Computation and Systems, V. 4, No. 2, April, 2004, 260&#150;271.</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=2042227&pid=S1405-5546200700010000400003&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">4. <b>Carvalho, J.P.</b>, <i>Rule Base&#150;based Cognitive Maps: Qualitative Dynamic Systems Modeling and Simulation. </i>PhD Thesis, Lisboa Technical University, Portugal, October, 2001, (in Portuguese).</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=2042228&pid=S1405-5546200700010000400004&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">5. <b>Chaib&#150;draa,   B.,   </b><i>Causal   Maps:    Theory,   Implementation,   and   Practical   Applications   in   Multiagent Environments. </i>J. IEEE Transactions on Knowledge and Data Engineering, V. 14, No. 6, November, 2002.</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=2042229&pid=S1405-5546200700010000400005&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">6. <b>Chin, D.N., </b><i>Empirical Evaluation of User Models and User&#150;Adapted Systems. </i>Int. J. of User Modeling and User&#150;Adapted Interaction, Kluwer Academic Publishers, 2001, 181&#150;194.</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=2042230&pid=S1405-5546200700010000400006&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">7. <b>Dickerson, J., </b>and <b>B. Kosko, </b>"Virtual Worlds in Fuzzy Cognitive Maps". In <i>Fuzzy Engineering, </i>edited by B., Kosko, Prentice Hall, NJ, 1997.</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=2042231&pid=S1405-5546200700010000400007&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">8. <b>Eden, C.J.</b>, <i>Thinking in Organizations. </i>London: Macmillan, 1979.</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=2042232&pid=S1405-5546200700010000400008&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">9. <b>Forrester, J.W., </b><i>Principles of Systems. </i>Waltham, MA: Pegasus Communications, 1968.</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=2042233&pid=S1405-5546200700010000400009&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">10. <b>Kelly, G. A., </b><i>The Psychology of Personal Constructs. </i>Norton, 1955.</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=2042234&pid=S1405-5546200700010000400010&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. <b>Klein, J.L., </b>and <b>D.F. Cooper, </b><i>Cognitive Maps Decision Markers in a Complex Game. </i>J. of Operational Research Soc., 2, 1982, 377&#150;393.</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=2042235&pid=S1405-5546200700010000400011&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">12. <b>Kosko, B., </b><i>Fuzzy Cognitive Maps. </i>Int. J. of Man&#150;Machine Studies, V. 24, 1986, 65&#150;75.</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=2042236&pid=S1405-5546200700010000400012&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">13. <b>Koulouriotis, D.E., I.E. Diakoulakis, D.M. Emiris, E.N. Antonidakis </b>and <b>I.A. Kaliakatsos, </b><i>Efficiently Modeling and Controlling Complex Dynamic Systems Using Evolutionary Fuzzy Cognitive Maps. </i>Int. J. of Computational Cognition, V. 1, No. 2, 2003, 41&#150;65.</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=2042237&pid=S1405-5546200700010000400013&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">14. <b>Leont'ev, <i>A., </i></b><i>Activity, Consciousness and Personality. </i>Englewood Cliffs, NJ. Prentice Hall, 1978.</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=2042238&pid=S1405-5546200700010000400014&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">15. <b>Miguelena, F., </b><i>Scientific Fundaments of the Models. </i>National Polytechnic Institute Press, Mexico, 2000, (in Spanish).</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=2042239&pid=S1405-5546200700010000400015&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">16. <b>Mohr, S., </b><i>Software Design for a Fuzzy Cognitive Map Modeling Tool. </i>66.698 Master's Project, Rensselaer Polytechnic Institute, 1997, URL: <a href="http://www.users.voicenet.com/%7Esmohr/fcm_white.html" target="_blank">http://www.users.voicenet.com/~smohr/fcm_white.html</a></a></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=2042240&pid=S1405-5546200700010000400016&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">17. <b>Montazemi, A.R., </b>and <b>D.W. Conrath, </b><i>The Use of Cognitive Mapping for Information Requirements Analysis. </i>MIS, 1986, 45&#150;56.</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=2042241&pid=S1405-5546200700010000400017&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">18. <b>Nakamura, K., S. Iwai </b>and <b>T. Sawaragi, </b><i>Decision Support Using Causation Knowledge Base, </i>J. IEEE Transactions on Systems, Man and Cybernetics, (12), 1982, 765&#150;777.</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=2042242&pid=S1405-5546200700010000400018&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">19. <b>Noriega, P.C., </b><i>Agent Mediated Auctions. The Fish market Metaphor. </i>PhD Dissertation, Barcelona University, Science College, Bellaterra, December, 1997.</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=2042243&pid=S1405-5546200700010000400019&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">20. <b>Parenth&ouml;en, M., J. Tisseay </b>and <b>T. Morineau, </b>"Believe decision for virtual actors". Paper presented at <i>IEEE International conference on Systems, Man and Cybernetics. </i>Hammamet, Tunes, October, 6&#150;9, 2002.</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=2042244&pid=S1405-5546200700010000400020&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">21. <b>Pe&ntilde;a, A.</b> and <b>F. Guti&eacute;rrez, </b>"Adaptive Learning through Cognitive Maps", in <i>E&#150;Learn 2004, World Conference on E&#150;Learning in Corporate, </i>Government, Healthcare, &amp; Higher Education, Washington, DC, USA. November, 1&#150;5, 2004, ISBN: 1&#150;880094&#150;54&#150;1.</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=2042245&pid=S1405-5546200700010000400021&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">22. <b>Pe&ntilde;a, A.</b> and <b>J.S. Sossa</b>, <i>Using Cognitive Maps to Develop a Student Model, </i>in <i>Proc. </i>Iberamia 2004, Puebla, M&eacute;xico, November 2004.</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=2042246&pid=S1405-5546200700010000400022&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">23. <b>Pe&ntilde;a, </b>A., <i>Collaborative Student Modeling by Cognitive Maps. </i>DFMA 2005,  1st International Conference Distributed Frameworks for Multimedia Applications, Edited by IEEE, French Chapter, Besan&ccedil;on, France February 2005<sup>a</sup>, pp. 160&#150;167.</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=2042247&pid=S1405-5546200700010000400023&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">24. <b>Pe&ntilde;a, A., J.S. Sossa</b>, and <b>F. Guti&eacute;rrez, </b><i>Negotiated Learning by Fuzzy Cognitive Maps, </i>WBE 05, 4th International Conference Web&#150;Based Education, IASTED, Grindelwald, Switzerland, February 2005<sup>a</sup>, pp. 590&#150;595.</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=2042248&pid=S1405-5546200700010000400024&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">25. <b>Pe&ntilde;a, A., J.S. Sossa</b>, and <b>F. Guti&eacute;rrez, </b><i>Knowledge and Reasoning Supported by Cognitive Maps. </i>MICAI'05, 4Th Mexican International Conference on Artificial Intelligence,  Springer Lecture Notes in Artificial Intelligence, Mty. M&eacute;xico, November 2005<sup>b</sup>, pp. 41&#150;50.</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=2042249&pid=S1405-5546200700010000400025&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">26. <b>Pe&ntilde;a, A., J.S. Sossa</b>, and <b>F. Guti&eacute;rrez, </b><i>Web&#150;Services based Ontology Agent. </i>2<sup>nd</sup> International Conference Distributed Frameworks for Multimedia Applications, Edited by IEEE, Malaysia Chapter. Univeristy Sains Malaysia, Penang, Malasia, May 2006.</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=2042250&pid=S1405-5546200700010000400026&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">27. <b>Wellman, M. P., </b><i>Inference in Cognitive Maps. </i>J. of Mathematics &amp; Computers in Simulation, 36, 1994.</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=2042251&pid=S1405-5546200700010000400027&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">28. <b>Zhang, W.R., </b><i>Soundness and Completeness of 4&#150;Valued Bipolar Logic, </i>J. Multi Valued Logic and Soft Computing, v. 9, 2003, 241&#150;256.</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=2042252&pid=S1405-5546200700010000400028&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> ]]></body><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Axelrod]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Structure of Decision: The Cognitive Maps of Political Elites]]></source>
<year>1976</year>
<publisher-loc><![CDATA[Princeton ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[A Survey about Fuzzy Cognitive Maps Papers]]></article-title>
<source><![CDATA[Int. J. of Computational Cognition]]></source>
<year>June</year>
<month>, </month>
<day>20</day>
<volume>3</volume>
<numero>2</numero>
<issue>2</issue>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Dynamic Random Fuzzy Cognitive Maps]]></article-title>
<source><![CDATA[Iberoameric J. of Computation and Systems]]></source>
<year>Apri</year>
<month>l,</month>
<day> 2</day>
<volume>4</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>260-271</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Carvalho]]></surname>
<given-names><![CDATA[J.P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Rule Base-based Cognitive Maps: Qualitative Dynamic Systems Modeling and Simulation]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chaib-draa]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Causal Maps: Theory, Implementation, and Practical Applications in Multiagent Environments]]></article-title>
<source><![CDATA[J. IEEE Transactions on Knowledge and Data Engineering]]></source>
<year>Nove</year>
<month>mb</month>
<day>er</day>
<volume>14</volume>
<numero>6</numero>
<issue>6</issue>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chin]]></surname>
<given-names><![CDATA[D.N.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Empirical Evaluation of User Models and User-Adapted Systems]]></article-title>
<source><![CDATA[Int. J. of User Modeling and User-Adapted Interaction]]></source>
<year>2001</year>
<page-range>181-194</page-range><publisher-name><![CDATA[Kluwer Academic Publishers]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dickerson]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kosko]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Virtual Worlds in Fuzzy Cognitive Maps]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Kosko]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[Fuzzy Engineering]]></source>
<year>1997</year>
<publisher-loc><![CDATA[NJ ]]></publisher-loc>
<publisher-name><![CDATA[Prentice Hall]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Eden]]></surname>
<given-names><![CDATA[C.J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Thinking in Organizations]]></source>
<year>1979</year>
<publisher-loc><![CDATA[London ]]></publisher-loc>
<publisher-name><![CDATA[Macmillan]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Forrester]]></surname>
<given-names><![CDATA[J.W.]]></given-names>
</name>
</person-group>
<source><![CDATA[Principles of Systems]]></source>
<year>1968</year>
<publisher-loc><![CDATA[Waltham ]]></publisher-loc>
<publisher-name><![CDATA[Pegasus Communications]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kelly]]></surname>
<given-names><![CDATA[G. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Psychology of Personal Constructs]]></source>
<year>1955</year>
<publisher-loc><![CDATA[Norton ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Klein]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Cooper]]></surname>
<given-names><![CDATA[D.F.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Cognitive Maps Decision Markers in a Complex Game]]></article-title>
<source><![CDATA[. of Operational Research Soc.]]></source>
<year>1982</year>
<numero>2</numero>
<issue>2</issue>
<page-range>377-393</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kosko]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Fuzzy Cognitive Maps]]></article-title>
<source><![CDATA[Int. J. of Man-Machine Studies]]></source>
<year>1986</year>
<volume>24</volume>
<page-range>65-75</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Koulouriotis]]></surname>
<given-names><![CDATA[D.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Diakoulakis]]></surname>
<given-names><![CDATA[I.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Emiris]]></surname>
<given-names><![CDATA[D.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Antonidakis]]></surname>
<given-names><![CDATA[E.N.]]></given-names>
</name>
<name>
<surname><![CDATA[Kaliakatsos]]></surname>
<given-names><![CDATA[I.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Efficiently Modeling and Controlling Complex Dynamic Systems Using Evolutionary Fuzzy Cognitive Maps]]></article-title>
<source><![CDATA[Int. J. of Computational Cognition]]></source>
<year>2003</year>
<volume>1</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>41-65</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Leont'ev]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Activity, Consciousness and Personality]]></source>
<year>1978</year>
<publisher-loc><![CDATA[Englewood Cliffs^eNJ NJ]]></publisher-loc>
<publisher-name><![CDATA[Prentice Hall]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Miguelena]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Scientific Fundaments of the Models]]></source>
<year>2000</year>
<publisher-loc><![CDATA[Mexico ]]></publisher-loc>
<publisher-name><![CDATA[National Polytechnic Institute Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mohr]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Software Design for a Fuzzy Cognitive Map Modeling Tool]]></source>
<year>1997</year>
<publisher-name><![CDATA[Rensselaer Polytechnic Institute]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Montazemi]]></surname>
<given-names><![CDATA[A.R.]]></given-names>
</name>
<name>
<surname><![CDATA[Conrath]]></surname>
<given-names><![CDATA[D.W.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Use of Cognitive Mapping for Information Requirements Analysis]]></source>
<year>1986</year>
<page-range>45-56</page-range><publisher-name><![CDATA[MIS]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nakamura]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Iwai]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Sawaragi]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Decision Support Using Causation Knowledge Base]]></article-title>
<source><![CDATA[. IEEE Transactions on Systems, Man and Cybernetics]]></source>
<year>1982</year>
<numero>12</numero>
<issue>12</issue>
<page-range>765-777</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Noriega]]></surname>
<given-names><![CDATA[P.C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Agent Mediated Auctions: The Fish market Metaphor]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Parenthöen]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Tisseay]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Morineau]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Believe decision for virtual actors]]></article-title>
<source><![CDATA[]]></source>
<year></year>
<conf-name><![CDATA[ IEEE International conference on Systems, Man and Cybernetics]]></conf-name>
<conf-date>October, 6-9, 2002</conf-date>
<conf-loc>Hammamet </conf-loc>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Adaptive Learning through Cognitive Maps]]></article-title>
<source><![CDATA[]]></source>
<year></year>
<conf-name><![CDATA[ E-Learn 2004, World Conference on E-Learning in Corporate, Government, Healthcare, & Higher Education]]></conf-name>
<conf-date>November, 1-5, 2004</conf-date>
<conf-loc>Washington, DC </conf-loc>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Sossa]]></surname>
<given-names><![CDATA[J.S.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Using Cognitive Maps to Develop a Student Model]]></article-title>
<source><![CDATA[Proc. Iberamia]]></source>
<year>Nove</year>
<month>mb</month>
<day>er</day>
<publisher-loc><![CDATA[Puebla ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Collaborative Student Modeling by Cognitive Maps]]></article-title>
<source><![CDATA[]]></source>
<year></year>
<conf-name><![CDATA[ 1st International Conference Distributed Frameworks for Multimedia Applications]]></conf-name>
<conf-date>February 2005</conf-date>
<conf-loc>Besançon </conf-loc>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Sossa]]></surname>
<given-names><![CDATA[J.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Negotiated Learning by Fuzzy Cognitive Maps]]></article-title>
<source><![CDATA[]]></source>
<year></year>
<conf-name><![CDATA[ 4th International Conference Web-Based Education]]></conf-name>
<conf-date>February 2005</conf-date>
<conf-loc>Grindelwald </conf-loc>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Sossa]]></surname>
<given-names><![CDATA[J.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Knowledge and Reasoning Supported by Cognitive Maps]]></article-title>
<source><![CDATA[]]></source>
<year></year>
<conf-name><![CDATA[ 4Th Mexican International Conference on Artificial Intelligence, Springer Lecture Notes in Artificial Intelligence]]></conf-name>
<conf-date>November 2005</conf-date>
<conf-loc>México </conf-loc>
</nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Sossa]]></surname>
<given-names><![CDATA[J.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Web-Services based Ontology Agent]]></article-title>
<source><![CDATA[]]></source>
<year></year>
<conf-name><![CDATA[ 2nd International Conference Distributed Frameworks for Multimedia Applications]]></conf-name>
<conf-date>May 2006</conf-date>
<conf-loc>Penang </conf-loc>
</nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wellman]]></surname>
<given-names><![CDATA[M. P.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Inference in Cognitive Maps]]></article-title>
<source><![CDATA[J. of Mathematics & Computers in Simulation]]></source>
<year>1994</year>
<numero>36</numero>
<issue>36</issue>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[W.R.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Soundness and Completeness of 4-Valued Bipolar Logic]]></article-title>
<source><![CDATA[J. Multi Valued Logic and Soft Computing]]></source>
<year>2003</year>
<volume>9</volume>
<page-range>241-256</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
