İsmail KAYABALI, et al. “RISC FACTORS IN BILIARY TRACT SURGERY (SOME REFLECTIONS ON 2000 PATIENTS HAVE BEEN TREATMENTED SURGICALLY)”. Turkish Journal of Gastroenterology, vol. 4, no. 1, Apr. 2020, pp. 169-74, https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/519.