Duryea J H, Ainsworth D M, Mauldin E A, Cooper B J, Edwards R B
Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA.
Equine Vet J. 1997 Mar;29(2):164-7. doi: 10.1111/j.2042-3306.1997.tb01662.x.