d'Offay J M, Ely R W, Baldwin C A, Whitenack D L, Stair E L, Collins J K
Department of Veterinary Parasitology, Microbiology, and Public Health, College of Veterinary Medicine, Oklahoma State University, Stillwater 74078, USA.
J Vet Diagn Invest. 1995 Apr;7(2):247-51. doi: 10.1177/104063879500700214.