Nishant, K., P. Bhutia, V. Kumar Singh, B. Kharga, B. Kumar Sharma, and N. Jain. “Prediction of Difficult Laparoscopic Cholecystectomy While Working up the Patient for Surgery”. Surgical Review: International Journal of Surgery, Trauma and Orthopedics, Vol. 3, no. 4, Dec. 2017, pp. 107-13, doi:10.17511/ijoso.2017.i04.03.