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1Texto bibliotecaECOSUR
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2by Lozada,F, Lezama,Y, Arias,F, Chacín,LF, Contreras,F, Celis,S, Medina,C, Hernández,A
Published 2001Digital revistaSCIELO -
3by Contreras,F, Jiménez,S, García,M, Rocafull,J, Montero,E, González,M, Ospino,N, Rodríguez,S, Fouilloux,C, Bolívar,A, Lezama,Y, Velasco,M
Published 2001Digital revistaSCIELO