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1Article of journalPublished in 1996Repositorio Universidad Nacional de Colombia
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6Published in 2005Repositorio Repositorio EAFIT
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8Article of journalPor Oliveros, AmandaPublished in 1992Repositorio Universidad Nacional de Colombia
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9Published in 2007Repositorio Repositorio EAFIT
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10Article of journalPor Bunder, M. W.Published in 1985Repositorio Universidad Nacional de Colombia
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11Article of journalPor Kearns, JohnPublished in 2004Repositorio Universidad Nacional de Colombia
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12Article of journalPor Corcoran, JohnPublished in 2009Repositorio Universidad Nacional de Colombia
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14Article of journalPublished in 1985Repositorio Universidad Nacional de Colombia
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15Published in 2006Repositorio Repositorio Uninorte
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16Article of journalPublished in 2007Repositorio Expeditio: repositorio UTadeo
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17Trabajo de grado de pregradoPublished in 2018Repositorio RIUD: repositorio U. Distrital
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18Article of journalPor Oostra, ArnoldPublished in 2003Repositorio Universidad Nacional de Colombia
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19Published in 2009Repositorio Repositorio EdocUR - U. Rosario
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20Article of journalPublished in 1985Repositorio Universidad Nacional de Colombia
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