Akhtar, M.U. et al. 2023. Comparison Between Analgesic Effects of Pre-Operative and Post-Operative Trocar Site Infiltration of Injection Bupivacaine in Elective Laparoscopic Cholecystectomy. Pakistan Armed Forces Medical Journal. 73, SUPPL-1 (Jul. 2023), S40–44. DOI:https://doi.org/10.51253/pafmj.v73iSUPPL-1.2697.