Liptak Julius M, Allan Graeme S, Krockenberger Mark B, Davis Phillip E, Malik Richard
University Veterinary Center, Faculty of Veterinary Science, The University of Sydney, New South Wales, Australia.
Vet Radiol Ultrasound. 2002 May-Jun;43(3):272-4. doi: 10.1111/j.1740-8261.2002.tb01002.x.