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1Article of journalPublished in 2011Repositorio Universidad Nacional de Colombia
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2Article of investigationPublished in 2008Repositorio Repositorio UdeA
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3Article of journalPor Ovalle Carranza, Demetrio Arturo; Jiménez Builes, Jovani Alberto; Collazos Ordóñez, César AlbertoPublished in 2006Repositorio Universidad Nacional de Colombia
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6Article of journalPublished in 2008Repositorio Universidad Nacional de Colombia
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