References
- Cordy , D. R. and Ribelin , W. E. 1950 . Six congenital cardiac abnormalities in animals . Cornell Vet. , 40 : 249 – 256 .
- Olafson , P. 1939 . Congenital abnormalities in animals . J. tech. Meth. Bull. int. Ass. med. Mus. , 19 : 129 – 134 .
- Smith , A. H. and Jones , T. C. 1961 . Veterinary Pathology , 2nd ed. , 789 – 791 . Philadelphia : Lea & Febiger .