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1Article of journalPublished in 2010Repositorio Universidad Nacional de Colombia
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2Published in 2011Repositorio Universidad Nacional de Colombia
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5Article of journalPor Ranson, BaldwinPublished in 1998Repositorio Universidad Nacional de Colombia
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15Article of journalPublished in 2006Repositorio Universidad Nacional de Colombia
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16Published in 2011Repositorio Universidad Nacional de Colombia
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