Matteucci M L, Ramirez O, Thrall D E
Department of Anatomy, Physiological Sciences and Radiology, College of Veterinary Medicine, North Carolina State University, Raleigh 27606, USA.
Vet Radiol Ultrasound. 1999 Jul-Aug;40(4):351-2. doi: 10.1111/j.1740-8261.1999.tb02123.x.