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1Published in 2013Repositorio Repositorio U. Sergio Arboleda
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2Published in 2005Repositorio Repositorio Universidad de la Sabana
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3Article of investigationPublished in 2014Repositorio Repositorio U. Sergio Arboleda
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7Article of journalPublished in 2007Repositorio Repositorio Universidad Javeriana
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8Article of journalPublished in 2014Repositorio Biblioteca Digital Universidad Externado de Colombia
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