1. Wicks ACB, Thomas GE, Clain DJ: Gastrointestinal phytobezoars in Africans. Am J Gastroenterol 64:392?396, 1975
2. Debakey M, Ochsner A: Bezoars and concretions. Surgery 5:132?152, 1939
3. Haley AE: Bezoars. Ann Intern Med 46:30?42, 1957
4. Rohner G, Koischwitz D, Straaten G, Gramann W: Oesophagusbezoar?seltene differentialdiagnose eines Oesophaguscarcinoms. Chirurg 48:545?548, 1977
5. mcNamara JJ, Paulson DL: Bezoar of the oesophagus. Ann Thorac Surg 4:171?174, 1967