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1Article of journalPor Escobar R, L.Published in 1967Repositorio Agrosavia
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2Article of journalPublished in 1940Repositorio Universidad Nacional de Colombia
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3Article of journalPublished in 2010Repositorio Universidad Nacional de Colombia
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4Article of journalPublished in 2007Repositorio Universidad Nacional de Colombia
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5Article of journalPor Brodmeier, KerilPublished in 2019Repositorio REDICUC - Repositorio CUC
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6Article of journalPublished in 2013Repositorio Universidad Nacional de Colombia
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