DOĞAN, Ümit Bilge, et al. “A Randeomized Prospective Trial Aomparing Results of Different Therapeutic Regimens in the Threatment of Duodenal Ulcer and Helicobacter Pylori Infection”. Turkish Journal of Gastroenterology, vol. 8, no. 3, Jan. 1997, pp. 342-5, https://www.turkjgastroenterol.org/index.php/tjg/article/view/814.