Lewis D D, Bronson D G, Samchukov M L, Welch R D, Stallings J T
Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, USA.
Vet Surg. 1998 Sep-Oct;27(5):454-64. doi: 10.1111/j.1532-950x.1998.tb00156.x.