Valentine B A, Scott E A, Watrous B J, Stonecipher C R
Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis 97331-4802, USA.
J Am Vet Med Assoc. 2000 Oct 1;217(7):993-4. doi: 10.2460/javma.2000.217.993.