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1Article of journalPublished in 2001Repositorio Universidad Nacional de Colombia
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2Article of journalPor Thomas, FlorencePublished in 2003Repositorio Universidad Nacional de Colombia
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3Article of journalPublished in 2002Repositorio Universidad Nacional de Colombia
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4Article of journalPublished in 1999Repositorio Universidad Nacional de Colombia
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5Article of journalPor Thomas, FlorencePublished in 1998Repositorio Universidad Nacional de Colombia
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6Article of journalPublished in 2001Repositorio Universidad Nacional de Colombia
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7Article of journalPublished in 2003Repositorio Universidad Nacional de Colombia
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