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1Article of journalPublished in 1990Repositorio Universidad Nacional de Colombia
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2Article of journalPublished in 2002Repositorio Universidad Nacional de Colombia
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3Article of journalPublished in 2004Repositorio Universidad Nacional de Colombia
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4Article of journalPublished in 2004Repositorio Universidad Nacional de Colombia
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5Article of journalPublished in 1993Repositorio Universidad Nacional de Colombia
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6Article of journalPublished in 2004Repositorio Universidad Nacional de Colombia
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7Article of journalPublished in 1992Repositorio Universidad Nacional de Colombia
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8Article of journalPublished in 1994Repositorio Universidad Nacional de Colombia
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9Article of journalPublished in 1991Repositorio Universidad Nacional de Colombia
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10Article of journalPublished in 2008Repositorio Universidad Nacional de Colombia
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