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1http://purl.org/coar/resource_type/c_c513Published in 2008Repositorio Universidad Nacional de Colombia
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2http://purl.org/coar/resource_type/c_c513Published in 2009Repositorio Universidad Nacional de Colombia
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3http://purl.org/coar/resource_type/c_c513Published in 1960Repositorio Repositorio Digital Univalle
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4http://purl.org/coar/resource_type/c_c513Published in 1960Repositorio Repositorio Digital Univalle
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