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1http://purl.org/coar/resource_type/c_c94fPublished in 2013Repositorio Universidad Nacional de Colombia
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2http://purl.org/coar/resource_type/c_c94fPublished in 2009Repositorio Repositorio ICESI
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3http://purl.org/coar/resource_type/c_c94fPublished in 2009Repositorio Repositorio ICESI