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1Article of journalPublished in 2008Repositorio Universidad Nacional de Colombia
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2Article of journalPor Lozano, IgnacioPublished in 2009Repositorio RIUCaC - Repositorio U. Católica
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3Article of journalPor Lozano, IgnacioPublished in 2009Repositorio RIUCaC - Repositorio U. Católica