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Detection of antibodies and risk factors for infection with bovine respiratory syncytial virus and parainfluenza virus-3 in beef cattle of Yucatan, Mexico[J] . J.J. Solís-Calderón,J.C. Segura-Correa,F. Aguilar-Romero,V.M. Segura-Correa.Preventive Veterinary Medicine . 2007 (1)