Patterson D F, Haskins M E, Jezyk P F, Giger U, Meyers-Wallen V N, Aguirre G, Fyfe J C, Wolfe J H
Section of Medical Genetics, School of Veterinary Medicine, University of Pennsylvania, Philadelphia 19104.
J Am Vet Med Assoc. 1988 Nov 1;193(9):1131-44.