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TORRES HERNÁNDEZ, G., GONZÁLEZ GARDUÑO, R., MENDOZA DEGIVES, P., RUÍZ RODRÍGUEZ, M. and VASQUEZ HERNÁNDEZ, M. 2009. Comparison of two grazing systems in the infestation with gastrointestinal nematodes of hair sheep. Veterinaria México OA. 37, 001 (Oct. 2009).