DOLAY, Kemal, and Aliye SOYLU. “Easy Sphincterotomy in Patients With Billroth II Gastrectomy: A New Technique”. Turkish Journal of Gastroenterology, vol. 19, no. 2, Jan. 2008, pp. 109-13, https://turkjgastroenterol.org/index.php/tjg/article/view/1643.