Mettifogo, E.; Muller, E. E.; Freitas, J. C. de; Megid, J.; Alfieri, A. A.; Beloti, V. Subclinical Mastitis by Corynebacterium Bovis in Catle from Northern Paraná, Brazil. Semina: Ciênc. Agrár. 1991, 12, 41-44.