1. G85-759 Prominent Congenital Defects in Nebraska Beef Cattle. Historical Materials from the University of Nebraska-Lincoln Extension;Johnson,1985
2. Survival of children born with congenital anomalies;Dastgiri;Arch Dis Child,2003
3. Anal and perianal surgery in dogs and cats;Holt;In Pract,1985
4. Surgery of the digestive system;Bright,1994
5. Rectum and anus;Aronson,2003