1. Shay H, Sun DCH. Etiology and pathology of gastric and duodenal ulcer. In: Bockus HL. Gastroenterology. Philadelphia-London: Saunders Elsevier; 1968;420-465
2. UNIDENTIFIED CURVED BACILLI IN THE STOMACH OF PATIENTS WITH GASTRITIS AND PEPTIC ULCERATION
3. Campylobacter pylori and Peptic Ulcer Disease
4. Profilaktika i lechenie hronicheskih zabolevanij verhnih otdelov zheludochno-kishechnogo trakta. Pod red. Ivashkina V.T. M.: MEDpress-inform; 2013;75-78. (In Russ.)
5. Teves PM, Ventura SS, Salgado EM. Characteristics of gastroduodenal ulcers in patients with negative biopsies for Helicobacter pylori. Acta Gastroenterológica Latinoamericana. 2010;40(1):40-45