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61Article of journalPublished in 1978Repositorio Universidad Nacional de Colombia
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62Article of journalPublished in 1968Repositorio Universidad Nacional de Colombia
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63Article of journalPublished in 2000Repositorio Universidad Nacional de Colombia
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64Article of journalPublished in 1997Repositorio Universidad Nacional de Colombia
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65Article of journalPublished in 1983Repositorio Universidad Nacional de Colombia
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66Article of journalPublished in 2000Repositorio Universidad Nacional de Colombia
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67Article of journalPublished in 1993Repositorio Universidad Nacional de Colombia
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68Article of journalPublished in 1995Repositorio Universidad Nacional de Colombia
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69Article of journalPublished in 2001Repositorio Universidad Nacional de Colombia
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70Article of journalPublished in 1980Repositorio Universidad Nacional de Colombia
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71Article of journalPublished in 1982Repositorio Universidad Nacional de Colombia
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72Article of journalPublished in 1987Repositorio Universidad Nacional de Colombia
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73Article of journalPublished in 1976Repositorio Universidad Nacional de Colombia
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74Article of journalPublished in 1970Repositorio Universidad Nacional de Colombia
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75Article of journalPublished in 1971Repositorio Universidad Nacional de Colombia
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76Article of journalPublished in 1993Repositorio Universidad Nacional de Colombia
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77Article of journalPublished in 1978Repositorio Universidad Nacional de Colombia
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78Article of journalPublished in 1967Repositorio Universidad Nacional de Colombia
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79Article of journalPublished in 1999Repositorio Universidad Nacional de Colombia
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80Article of journalPublished in 1975Repositorio Universidad Nacional de Colombia
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