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2232http://purl.org/coar/version/c_b1a7d7d4d402bccePublished in 2012Repositorio Repositorio UIS
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2233Article of journalPor Gómez, Carlos H.Published in 1986Repositorio Repositorio UNAB
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2238Article of journalPublished in 2015Repositorio Biblioteca Digital Universidad Externado de Colombia
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