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5by Juan Augusto Perna Contreras, Clemencia Gutierrez Sánchez, Hector Alan Pérez DuarteGet full text
Published 2001-12-01
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6by Juan Augusto Perna, Iván Pérez H., Julia Eugenia Ramírez, Maŕia Elena Varela DGet full text
Published 2002-06-01
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