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1http://vocabularies.coar-repositories.org/pubby/resource_type/c_6501Published in 1998Repositorio Repositorio UdeA
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2http://vocabularies.coar-repositories.org/pubby/resource_type/c_6501Published in 2008Repositorio Repositorio UdeA
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3http://vocabularies.coar-repositories.org/pubby/resource_type/c_6501Published in 2011Repositorio Repositorio UdeA