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269Article of journalPublished in 1991Repositorio Universidad Nacional de Colombia“... and Ferns. 8th. ed Cambridge University Press, Cambridge, U.K. (Student Edition, 1985; Reprint, 1988...”
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279Article of journalPublished in 2018Repositorio Biblioteca Digital Universidad Externado de ColombiaGet full text
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280Article of journalPublished in 2015Repositorio Biblioteca Digital Universidad Externado de ColombiaGet full text
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