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1Article of journalPublished in 2001Repositorio Universidad Nacional de Colombia
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2Article of journalPublished in 1996Repositorio Universidad Nacional de Colombia
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3Article of journalPublished in 2015Repositorio Universidad Nacional de Colombia
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5Article of journalPublished in 2001Repositorio Universidad Nacional de Colombia
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6Published in 2011Repositorio Universidad Nacional de Colombia
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7Doctoral thesisPublished in 2016Repositorio Universidad Nacional de Colombia
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