1. Papilloma of duodenum;Perry;Trans. Path. Soc. London,1892
2. Primary tumors of the duodenum;Ebert;Surg. Gynec. Obstet.,1953
3. Benigntumors of the duodenum;Hoffman;Amer. J. Surg.,1945
4. Tumors of the small intestine;Raiford;Arch. Surg.,1932
5. Collective review: Benign neoplasms of the small intestine. A critical comprehensive review with reports of 20 new cases;River;Surg. Gynec. Obstet., Int. Abst., Surg.,1956