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4Article of journalPublished in 2009Repositorio Universidad Nacional de Colombia
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5Article of journalPublished in 2008Repositorio Universidad Nacional de Colombia
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6Article of journalPublished in 2008Repositorio Universidad Nacional de Colombia
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7Article of journalPublished in 1999Repositorio Universidad Nacional de Colombia
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9Article of journalPublished in 2012Repositorio Universidad Nacional de Colombia
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10Article of journalPublished in 2009Repositorio Universidad Nacional de Colombia
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11Article of journalPublished in 2012Repositorio Universidad Nacional de Colombia
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12Article of journalPublished in 2011Repositorio Universidad Nacional de Colombia
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13Article of journalPublished in 2007Repositorio Universidad Nacional de Colombia
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14Article of journalPublished in 2009Repositorio Universidad Nacional de Colombia
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15Article of journalPublished in 2010Repositorio Universidad Nacional de Colombia
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16Article of journalPublished in 2009Repositorio Universidad Nacional de Colombia
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18Article of journalPublished in 2008Repositorio Universidad Nacional de Colombia
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19Article of journalPublished in 2009Repositorio Universidad Nacional de Colombia
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20Article of journalPublished in 2012Repositorio Universidad Nacional de Colombia
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