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61
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64
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66Article of journalPublished in 2010Repositorio REDICUC - Repositorio CUC
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67
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71Article of journalPublished in 1999Repositorio Repositorio U. de Caldas
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75Article of journalPublished in 2015Repositorio Universidad Nacional de Colombia
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76Article of journalPublished in 2009Repositorio Universidad Nacional de Colombia
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77Article of journalPor Thomas, Florence; Restrepo, Gabriel; Ramírez, Ana Lucía; Roelens, Tatiana; Gutiérrez Malaver, María ElsaPublished in 1993Repositorio Universidad Nacional de Colombia
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78Article of journalPublished in 1973Repositorio Universidad Nacional de Colombia
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79
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80