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1Article of journalPublished in 1937Repositorio Universidad Nacional de Colombia
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2Article of journalPublished in 1945Repositorio Universidad Nacional de Colombia
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3Article of journalPublished in 1938Repositorio Universidad Nacional de Colombia
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4Article of journalPublished in 1995Repositorio Universidad Nacional de Colombia
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5Article of journalPublished in 2000Repositorio Universidad Nacional de Colombia
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6Article of journalPublished in 1945Repositorio Universidad Nacional de Colombia
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7Article of journalPublished in 1945Repositorio Universidad Nacional de Colombia
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