M. Mahir Özmen, et al. “The Importance of Endoscopic Spinchterotomy in Biliary Fistulas Secondary to Hydatid Disease of Liver”. Turkish Journal of Gastroenterology, vol. 10, no. 1, July 2019, pp. 52-54, https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/1541.