<?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>2448-718X</journal-id>
<journal-title><![CDATA[El trimestre económico]]></journal-title>
<abbrev-journal-title><![CDATA[El trimestre econ]]></abbrev-journal-title>
<issn>2448-718X</issn>
<publisher>
<publisher-name><![CDATA[Fondo de Cultura Económica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2448-718X2010000401007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Determinantes de cumplimiento en el programa de tasas retributivas en colombia. El caso de Corpochivor]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Briceño]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Concepción Programa Magíster en Economía de Recursos Naturales y del Medio Ambiente ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Concepción Departamento de Economía ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<volume>77</volume>
<numero>308</numero>
<fpage>1007</fpage>
<lpage>1036</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-718X2010000401007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-718X2010000401007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-718X2010000401007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Evaluamos los factores que influyen en las decisiones de informar las cargas contaminantes y aquellos referidos al cumplimiento en el pago de impuestos a vertidos de parte de fuentes reguladas con el Programa de Tasas Retributivas de Colombia (PTRC). El análisis utiliza una base de datos que contiene información de cada fuente individual según la jurisdicción de la Corporación Autónoma Regional del Chivor (Corpochivor), para el periodo 2001-2006. Los resultados de las estimaciones econométricas sugieren que el informe de vertidos es afectado por el tamaño del sector productivo al que pertenece la fuente, la tasa retributiva cobrada para demanda bioquímica de oxígeno (DBO5)y actividades de fiscalización ejercidas por la corporación en las fuentes reguladas. La estimación para el cumplimiento en el pago de la tasa indica que las acciones de fiscalización ejercidas por la Corpochivor no son determinantes en el cumplimiento individual de las fuentes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: We evaluate the factors that influence the reported level of pollution and those referred to the compliance with the payment of discharge fees from sources regulated under the Colombia's Discharge Fee Program. The analysis uses a data set that contains information at plant level and considers individual sources operating under the jurisdiction of the Regional Autonomous Corporation of the Chivor (Corpochivor), for period 2001-2006. The results of the econometric estimations suggest that the report of discharges is affected by the size of the sector to which the source belongs, the level of discharge fee for BDO5, and enforcement and control actions exerted by the corporation's authorities on the regulated sources. The estimation for the compliance in the payment of the discharge fee indicates that the actions of enforcement exercised by Corpochivor are not determinants on the individual sources' compliance decision.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[fiscalización]]></kwd>
<kwd lng="es"><![CDATA[cumplimento]]></kwd>
<kwd lng="es"><![CDATA[impuestos a efluentes]]></kwd>
<kwd lng="es"><![CDATA[programa de tasa retributivas]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arjona]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Molina]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[L. F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Desafíos y propuestas para la implementación más efectiva de instrumentos económicos en la gestión ambiental de América Latina y el Caribe: El Caso de Colombia]]></source>
<year>2000</year>
<publisher-name><![CDATA[CEPAL-ECLAC, División de Medio Ambiente y Asentamientos Humanos]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<collab>Banco Mundial</collab>
<source><![CDATA[Five Years After Rio: Innovations in Environmental Policy, Rio Edition]]></source>
<year>1997</year>
<publisher-loc><![CDATA[Washington ]]></publisher-loc>
<publisher-name><![CDATA[Banco Mundial]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Direct and Indirect Effects of Regulation: A New Look at OSHA'S Impact]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bartel]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Thomas]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Law &amp; Economies]]></source>
<year>1985</year>
<volume>XXVIII</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>1-25</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Baumol]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Oates]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Theory of Environmental Policy]]></source>
<year>1988</year>
<edition>segunda</edition>
<publisher-name><![CDATA[Cambridge University Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Colombia's Discharge Fee Program: Incentives for Polluters or Regulators?]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Blackman]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Management]]></source>
<year>2009</year>
<volume>90</volume>
<page-range>101-19</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[L. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Caycedo]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Jaramillo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Aplicación del principio contaminador pagador en América Latina: Evaluación de la efectividad ambiental y eficiencia económica de la tasa por contaminación hídrica en el sector industrial colombiano]]></source>
<year>2001</year>
<publisher-name><![CDATA[ECLAC]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Bonilla]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Análisis econométrico de la efectividad y eficiencia del programa de tasas retributivas en Colombia]]></source>
<year>2003</year>
<publisher-name><![CDATA[Universidad de Los Andes, Facultad de Economía]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="">
<collab>Comisión Económica para América Latina y el Caribe (CEPAL)</collab>
<source><![CDATA[Instrumentos económicos para el control de la cotaminación del agua: Condiciones y casos de Aplicación]]></source>
<year>2000</year>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Imperfect Observability of Emissions and Second-Best Emission and Output Taxes]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cremer]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Gahvari]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Public Economics]]></source>
<year>2002</year>
<volume>85</volume>
<page-range>385-407</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[What Improves Environmental Compliance? Evidence From Mexican Industry]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dasgupta]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Hettige]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Wheeler]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Economics and Management]]></source>
<year>2000</year>
<numero>39</numero>
<issue>39</issue>
<page-range>39-66</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="">
<source><![CDATA[Decreto 901 del 1 de abril de 1997, Ministerio del Medio Ambiente, República de Colombia]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="">
<source><![CDATA[Decreto 3100 del 30 de octubre de 2003, Ministerio de Ambiente Vivienda y Desarrollo Territorial, República de Colombia]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Incomplete Enforcement with Endogenous Regulatory Choice]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Garvie]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Keeler]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Public Economics]]></source>
<year>1994</year>
<volume>55</volume>
<page-range>141-62</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Compliance and Enforcement: Air Pollution Regulation in the US. Steel Industry]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gray]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Deily]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Economics and Management]]></source>
<year>1996</year>
<volume>31</volume>
<page-range>96-111</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hanley]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Shogren]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[White]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environmental Economics in Theory and Practice]]></source>
<year>2007</year>
<edition>segunda</edition>
<publisher-name><![CDATA[Palgrave-Macmillan]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Firm Behavior under Imperfectly Enforceable Pollution Standards and Taxes]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harford]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Economics and Management]]></source>
<year>1978</year>
<volume>5</volume>
<page-range>26-43</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Self-Reporting of Pollution and the Firm's Behavior Under Imperfectly Enforceable Regulations]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harford]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Economics and Management]]></source>
<year>1987</year>
<volume>14</volume>
<page-range>293-303</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Environmental Inspections and Emissions of the Pulp and Paper Industry: The Case of Quebec]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Laplante]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Rislstone]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Policy Research Working Paper]]></source>
<year>1995</year>
<numero>1447</numero>
<issue>1447</issue>
<publisher-name><![CDATA[Banco Mundial]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Optimal Enforcement Policy and Firms, Emissions and Compliance with Environmental Taxes]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Macho-Stadler]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Pérez-Castrillo]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Economics and Management]]></source>
<year>2006</year>
<volume>51</volume>
<page-range>110-31</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Effectiveness of the EPA's Regulatory Enforcement: The Case of Industrial Effluent Standards]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Magat]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Viscusi]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Law and Economics]]></source>
<year>1990</year>
<volume>33</volume>
<page-range>331-60</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Markets for Pollution Control when Firms are Noncompliant]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Malik]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Economics and Management]]></source>
<year>1990</year>
<volume>18</volume>
<page-range>97-106</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="">
<collab>Ministerio del Medio Ambiente de Colombia (MMA)</collab>
<source><![CDATA[Evaluación del programa de tasas retributivas en Colombia]]></source>
<year>2004</year>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[A Market-Based Environmental Policy Experiment in Chile]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Montero]]></surname>
<given-names><![CDATA[J. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Katz]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Law and Economics]]></source>
<year>2002</year>
<volume>45</volume>
<page-range>267-87</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Análisis del mercado de emisiones de material particulado en Santiago]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Montero]]></surname>
<given-names><![CDATA[J. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Katz]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Estudios Públicos]]></source>
<year>2001</year>
<volume>81</volume>
<page-range>177-203</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Determinants of Compliance in the Emissions Compensation Program in Santiago, Chile]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Palacios]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Chávez]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environment and Development Economics]]></source>
<year>2005</year>
<volume>10</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>453-83</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Programa de compensación de emisiones: Evaluación de su diseño de fiscalización y cumplimiento]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Palacios]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Chávez]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Estudios Públicos]]></source>
<year>2002</year>
<volume>88</volume>
<page-range>97-126</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rudas]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Instrumentos económicos y regulación de la contaminación industrial: primera aproximación al caso del Río Bogotá]]></source>
<year>2006</year>
<publisher-name><![CDATA[Facultad de Ciencias Económicas y Administrativas, Universidad Pontificia Javeriana]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Efficient Environmental Policy with Imperfect Compliance]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sandmo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environmental and Resource Economics]]></source>
<year>2002</year>
<volume>23</volume>
<page-range>85-103</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Endogenous Monitoring and Enforcement of a Transferable Emissions Permit System]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stranlund]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Dhanda]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Economics and Management]]></source>
<year>1999</year>
<volume>38</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>267-82</page-range></nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Effective Enforcement of a Transferable Emissions Permit System with a Self-Reporting Requirement]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stranlund]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Chávez]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Regulatory Economics]]></source>
<year>2000</year>
<volume>18</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>113-31</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Risk Aversion and Compliance in Markets for Pollution Control]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stranlund]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Management]]></source>
<year>2007</year>
<volume>88</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>203-10</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The Optimal Pricing of Pollution when Enforcement is Costly]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stranlund]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Chávez]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Villena]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Environmental Economics and Management]]></source>
<year>2009</year>
<volume>58</volume>
<page-range>183-91</page-range></nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="book">
<collab>Universidad Nacional de Colombia, Sede Medellín</collab>
<source><![CDATA[Regulación de la contaminación hídrica en Colombia: Capacidad institucional y niveles de cumplimiento]]></source>
<year>2005</year>
<publisher-name><![CDATA[Facultad de Minas]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
