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61
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62
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63
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64Published in 2007Repositorio Repositorio EAFIT
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65
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66Article of journalPublished in 2008Repositorio Repositorio Institucional Unicórdoba
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67Published in 2007Repositorio Repositorio EAFIT
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68Published in 2005Repositorio Repositorio Universidad de la Sabana
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69
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70
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71
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72Article of journalPublished in 2010Repositorio REDICUC - Repositorio CUC
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73
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74
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75
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76
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77
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78Article of journalPublished in 2006Repositorio Repositorio Institucional U. Caldas
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79
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80Published in 2007Repositorio Repositorio Universidad de la Sabana
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