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1http://purl.org/coar/resource_type/c_c94fPublished in 2000Repositorio Universidad Nacional de Colombia
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2http://purl.org/coar/resource_type/c_c94fPublished in 2000Repositorio Universidad Nacional de Colombia
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3http://purl.org/coar/resource_type/c_c94fPublished in 2000Repositorio Universidad Nacional de Colombia
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4Article of journalPublished in 2001Repositorio Universidad Nacional de Colombia
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5http://purl.org/coar/resource_type/c_c94fPublished in 2002Repositorio Universidad Nacional de Colombia
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6http://purl.org/coar/resource_type/c_c94fPublished in 2002Repositorio Universidad Nacional de Colombia
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7Article of journalPublished in 1997Repositorio Universidad Nacional de Colombia
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8Article of journalPublished in 2002Repositorio Universidad Nacional de Colombia
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