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1Article of journalPublished in 2000Repositorio Universidad Nacional de Colombia
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2Article of journalPor Parra, AndrésPublished in 2010Repositorio Universidad Nacional de Colombia
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3Article of journalPublished in 1958Repositorio Universidad Nacional de Colombia
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4Article of journalPublished in 2017Repositorio RED: Repositorio Educativo Digital UAO
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5Article of journalPublished in 2016Repositorio Biblioteca Digital Universidad Externado de Colombia
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