P. Palaniappaan, R. K. K. V, and T. S. K, “Efficacy of Intraperitoneal 0.25% Levobupivacaine for Postoperative Analgesia Following Laparoscopic Cholecystectomy: A Prospective Randomised Double-blinded Controlled Trial”, Int J Clin Anesth Res, pp. 4–8, Jul. 2026.