Lewis M G, Lafrado L J, Haffer K, Gerber J, Sharpee R L, Olsen R G
Department of Veterinary Pathobiology, College of Veterinary Medicine, Ohio State University, Columbus 43210.
Vet Microbiol. 1988 Jul;17(3):297-308. doi: 10.1016/0378-1135(88)90071-5.