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699721Article of journalPublished in 2017Repositorio Repositorio Institucional UPN
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699722Article of journalPublished in 1990Repositorio Repositorio Institucional UPN
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699723Article of journalPublished in 2009Repositorio Repositorio Institucional UPN
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699724
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699725
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699726
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699727Article of journalPublished in 2009Repositorio Repositorio Digital Universidad de los LLanos
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699728
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699729Article of journalPublished in 2001Repositorio Universidad Nacional de Colombia
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699730
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699731
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699732
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699733Article of journalPublished in 2018Repositorio Repositorio Universidad de Cartagena
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699734
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699735
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699736
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699737
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699738