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21Article of journalPublished in 2015Repositorio Repositorio Institucional U. Caldas
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22Published in 2010Repositorio Repositorio EdocUR - U. Rosario
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24Published in 2009Repositorio Repositorio EdocUR - U. Rosario
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25Published in 2009Repositorio Repositorio Institucional USTA
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26Published in 2009Repositorio Universidad Santo Tomás
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27Published in 2009Repositorio Repositorio Institucional USTA
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28Article of journalPublished in 2014Repositorio Repositorio Universidad Javeriana
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30Article of journalPublished in 2014Repositorio RIUCaC - Repositorio U. Católica
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31Article of journalPublished in 2013Repositorio Repositorio Digital Universidad de los LLanos
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34Article of journalPublished in 2015Repositorio Repositorio Universidad Javeriana
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37Article of journalPor López Medina, Diego Eduardo; Universidad de los Andes; Sánchez Mejía, Astrid Liliana; Pontificia Universidad JaverianaPublished in 2008Repositorio Repositorio Universidad Javeriana
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40Published in 2007Repositorio Repositorio Universidad de la Sabana
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