Perkins Paula C., Grindem Carol B., Levy Julie K.
Department of Microbiology, Pathology, and Parasitology, College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough Street, Raleigh, NC 27606.
Vet Clin Pathol. 1995;24(3):77. doi: 10.1111/j.1939-165x.1995.tb00941.x.