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By: Azuara Hern ández, L - Silos Espino, H - Perales Segovia, C - Gómez Leyva, Juan Florencio - Alpuche Solís, AG - Macias Valdez, LMType: ArticleIn: Phyton (Buenos Aires)Volume:Series:Issue:Date: 2008-12-01Page Range:Publication Info:Subjects: