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21Article of journalPublished in 1993Repositorio Universidad Nacional de Colombia
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22Article of journalPublished in 1996Repositorio Universidad Nacional de Colombia
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23Article of journalPublished in 2013Repositorio Universidad Nacional de Colombia
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25Trabajo de grado de pregradoPublished in 2010Repositorio Séneca: repositorio Uniandes
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26Trabajo de grado de pregradoPublished in 2010Repositorio Séneca: repositorio Uniandes
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27Published in 1995Repositorio Repositorio UIS
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28Article of journalPublished in 2014Repositorio Universidad Nacional de Colombia
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29Article of journalPublished in 1997Repositorio Universidad Nacional de Colombia
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30Article of journalPublished in 1984Repositorio Universidad Nacional de Colombia
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31Article of journalPublished in 1997Repositorio Universidad Nacional de Colombia
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32Article of journalPublished in 2000Repositorio Universidad Nacional de Colombia
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33Article of journalPor Tunc, CemilPublished in 2017Repositorio Universidad Nacional de Colombia
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34Article of journalPublished in 1969Repositorio Universidad Nacional de Colombia
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35Article of journalPublished in 2007Repositorio Universidad Nacional de Colombia
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36Article of journalPublished in 1988Repositorio Universidad Nacional de Colombia
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37http://purl.org/coar/resource_type/c_f744Published in 2008Repositorio Repositorio Institucional ECI
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38Article of journalPor Bohórquez, JaimePublished in 2008Repositorio Repositorio Institucional ECI
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39Published in 2012Repositorio Repositorio EAFIT
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40Published in 2009Repositorio Repositorio EAFIT
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