1. Primary duodenal tumors: a study of 31 cases;Charles;Arch Intern Med,1963
2. Villous tumors of the duodenum;Spira;Am J Gastroenterol,1977
3. Endoscopic studies of polypoid lesions on the duodenal bulb;Ohishi;Gastroenterol Endosc,1984
4. Clinico-pathological study of duodenal adenoma;Yamanaka;Gastroenterol Endosc,1987
5. Adenoma and carcinoma of the duodenum and papilla of Vater: a clinicopathologic study;Seifert;Am J Gastroenterol,1992