Nayal, D., A. Bijalwan, P. Singhal, and A. Kumar. “Evaluation of Role of Peri Portal Infiltration of Ropivacaine in Post Laparoscopic Cholecystectomy Pain Management: A Randomized Controlled Double-Blind Study”. International Surgery Journal, vol. 10, no. 8, July 2023, pp. 1340-3, doi:10.18203/2349-2902.isj20232330.