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1Article of investigationPublished in 2013Repositorio Repositorio ICESI
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2Article of journalPublished in 2010Repositorio Biblioteca Digital Universidad Externado de Colombia
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3Article of journalPublished in 2008Repositorio Repositorio Universidad Javeriana
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4Article of journalPublished in 2010Repositorio Repositorio Universidad Javeriana
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5Article of journalPublished in 2004Repositorio Universidad Nacional de Colombia
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