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by Galmarini, Marco Aurelio
by Vispo, Adolfo
by Dworkin, Ronald
by Barrado, Castor Diaz; Morett, Martin G. Romero
by Gonzalez, Angela Sierra; Ruiz, Maria Del Pino de la Nuez
by Figueroa, Juan Guillermo
by Dyson, Freeman John
by Aranburu, Joseba Arregi; Arteche, Luis Castells; Basaguren, Alberto Lo´pez; et al.
by ANTONIO PULIDO
by Héctor Enrique Jaramillo, Christian Puttlitz, José María García.