1. Scarpa A, Pederzoli P, Zamboni G: Genetics of Pancreatic and Ampullary Tumors. In: Advances in Pancreatic Disease. Edited by: CG Dervenis. 1996, Stuttgard – New York: George Thieme Verlag., 2-11.
2. Sherlock SH, Dooley J: Disease of the Ampulla of Vater and Pancreas. In: Disease of the Liver and Biliary System. 1993, London: Blackwell Scientific Publications., 599-605. 9
3. Kimmey MB, Yasuda K, Kawai K: Endoscopic Ultrasound. In Textbook of Gastroenterology. Edited by: T Yamada, DH Alpers, Owyang C, Powell DW, Silverstein FE. 1991, Philadelphia: J. B. Lippincott, Two: 2343-2360.
4. Ashkar K, Deeb LS, Bikhazi K, Arnaout MS: Unusual manifestation of an ampullary tumor presenting with severe upper gastrointestinal bleeding. Digestion. 1999, 60: 583-586. 10.1159/000007711.
5. Chak A: Endoscopic Ultrasonography. Endoscopy. 2000, 32: 146-152. 10.1055/s-2000-90.