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by C., Perez
by Griva, Igor; Nash, Stephen G.; Sofer, Ariela
by Frutos, Luis Vazquez De; Jimenez, Salvador
by Cottle, Richard W.; Thapa, Mukund N.
by Richard W. Cottle; Mukund N. Thapa
by Vazquez, Luis; Jimenez, Salvador
by Luis Vázquez; Salvador Jimenez