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By: Martínez-De-La-Cerda Jesús - Olivares-Saénz, Emilio - Salinas-García, Gilberto E. - Závala-García, Francisco - Aranda-Ruiz, JuanaType: ArticleIn: Phyton (Buenos Aires)Volume:Series:Issue:Date: 2004-12-01Page Range:Publication Info:Subjects: