Acharya, Bishal, et al. “Preoperative Prediction of Difficult Laparoscopic Cholecystectomy Using Risk Score for Conversion from Laparoscopic to Open Cholecystectomy: An Observational Study”. Journal of Institute of Medicine Nepal, vol. 46, no. 2, Aug. 2024, pp. 43-48, https://www.nepjol.info/index.php/JIOM/article/view/79595.