Darrigrand-Haag R A, Center S A, Randolph J F, Lewis R M, Wood P A
Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca, USA.
J Vet Intern Med. 1996 Nov-Dec;10(6):412-9. doi: 10.1111/j.1939-1676.1996.tb02090.x.