A. Calderon Rangel, V. Rodríguez Rodríguez, G. Arrieta Bernate, and S. Mattar Velilla, “Prevalence of mastitis in dual purpose cattle farms in Monteria (Colombia): etiology and antibacterial susceptibility”, Rev. colomb. cienc. pecu., vol. 24, no. 1, pp. 19–28, Apr. 2011.