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81Article of journalPublished in 1984Repositorio Universidad Nacional de Colombia
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82Article of journalPublished in 1999Repositorio Universidad Nacional de Colombia
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83Article of journalPublished in 1991Repositorio Universidad Nacional de Colombia
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84Article of journalPublished in 1987Repositorio Universidad Nacional de Colombia
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85Article of journalPublished in 1982Repositorio Universidad Nacional de Colombia
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86Article of journalPublished in 1984Repositorio Universidad Nacional de Colombia
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87Article of journalPublished in 2000Repositorio Universidad Nacional de Colombia
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88Article of journalPublished in 1996Repositorio Universidad Nacional de Colombia
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89Article of journalPublished in 1978Repositorio Universidad Nacional de Colombia
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90Article of journalPublished in 1991Repositorio Universidad Nacional de Colombia
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91Article of journalPublished in 1982Repositorio Universidad Nacional de Colombia
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92Article of journalPublished in 1973Repositorio Universidad Nacional de Colombia
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93Article of journalPublished in 1992Repositorio Universidad Nacional de Colombia
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94Article of journalPublished in 1995Repositorio Universidad Nacional de Colombia
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95Article of journalPublished in 2002Repositorio Universidad Nacional de Colombia
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96Article of journalPublished in 1995Repositorio Universidad Nacional de Colombia
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97http://purl.org/coar/resource_type/c_816bPublished in 2003Repositorio Universidad Nacional de Colombia
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98Article of journalPublished in 1982Repositorio Universidad Nacional de Colombia
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99Article of journalPublished in 1988Repositorio Universidad Nacional de Colombia
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100Article of journalPublished in 1993Repositorio Universidad Nacional de Colombia
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