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artículo
Publicado 2011
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This work was supported by a Collaborative Research Grant from CSIC-CONCYTEC, National University of the Peruvian Amazonia, Iquitos, Peru, Ministerio de Educacion y Ciencia, Spain (CTQ2009-14629-C02-01) and a predoctoral MAEC-AECID fellowship to L. R. Vasquez.