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1Article of journalPublished in 1999Repositorio Universidad Nacional de Colombia
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2Article of journalPublished in 1984Repositorio Universidad Nacional de Colombia
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3Article of journalPublished in 2002Repositorio Universidad Nacional de Colombia
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4Article of journalPublished in 1971Repositorio Universidad Nacional de Colombia
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5Article of journalPublished in 1976Repositorio Universidad Nacional de Colombia
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6Article of journalPublished in 1985Repositorio Universidad Nacional de Colombia
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7Article of journalPublished in 1993Repositorio Universidad Nacional de Colombia
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8Article of journalPublished in 1975Repositorio Universidad Nacional de Colombia
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9Article of journalPublished in 1991Repositorio Universidad Nacional de Colombia
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10Article of journalPublished in 1999Repositorio Universidad Nacional de Colombia
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11Article of journalPublished in 2000Repositorio Universidad Nacional de Colombia
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12Article of journalPublished in 1987Repositorio Universidad Nacional de Colombia
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13Article of journalPublished in 1982Repositorio Universidad Nacional de Colombia
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14Article of journalPublished in 1975Repositorio Universidad Nacional de Colombia
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15Article of journalPublished in 1985Repositorio Universidad Nacional de Colombia
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16Article of journalPublished in 2000Repositorio Universidad Nacional de Colombia
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17Article of journalPublished in 1994Repositorio Universidad Nacional de Colombia
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18Article of journalPublished in 1982Repositorio Universidad Nacional de Colombia
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19Article of journalPublished in 1990Repositorio Universidad Nacional de Colombia
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20Article of journalPublished in 1978Repositorio Universidad Nacional de Colombia
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