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5Article of journalPublished in 2006Repositorio Repositorio Universidad Javeriana
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6Article of journalPublished in 1959Repositorio Universidad Nacional de Colombia
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9Article of journalPublished in 2012Repositorio Biblioteca Digital Universidad Externado de Colombia
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10Article of journalPublished in 2018Repositorio Repositorio U. de Caldas
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11Article of journalPublished in 2018Repositorio Repositorio Institucional U. Caldas
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12Article of journalPublished in 2016Repositorio Repositorio UDEM
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14Article of journalPublished in 2016Repositorio Repositorio UDEM
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18Published in 2012Repositorio Universidad Nacional de Colombia
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19http://purl.org/coar/version/c_b1a7d7d4d402bccePublished in 2014Repositorio Repositorio UIS
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20Trabajo de grado de pregradoPublished in 2016Repositorio Repositorio Institucional UPN