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29881Published in 2009Repositorio Repositorio Institucional USTA
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29882
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29883
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29884
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29885
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29886Article of journalPublished in 1992Repositorio Universidad Nacional de Colombia
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29887
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29888
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29889
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29890
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29891
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29892
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29893
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29894
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29895
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29896
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29897
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29898Article of journalPublished in 2018Repositorio Repositorio UCC
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29899Article of journalPublished in 2010Repositorio Repositorio Universidad Javeriana
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29900