Kraus M S, Mahaffey M B, Girard E, Chambers J N, Brown C A, Coates J R
Department of Small Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, USA.
Vet Radiol Ultrasound. 1997 Jan-Feb;38(1):39-41. doi: 10.1111/j.1740-8261.1997.tb01600.x.