OKÇU, Nihat, Tahir BURAN, M. Derya ONUK, Arif YILMAZ, Ersin AKARSU, and Güngör AKÇAY. “Prevalence of Helicobacter Pylori in Patients With Duodenal Ulcer”. Turkish Journal of Gastroenterology 6, no. 4 (January 4, 1995): 447–450. Accessed January 1, 2026. https://www.turkjgastroenterol.org/index.php/tjg/article/view/666.