Shakya, S., P. Vaidya, and B. Paudel. “Comparative Study of Opioid Free Versus Opioid Anaesthesia in Patients Undergoing Laparoscopic Cholecystectomy”. Journal of Nepalgunj Medical College, vol. 20, no. 2, Dec. 2022, pp. 14-18, doi:10.3126/jngmc.v20i2.51833.