“Comparative study between transdermal buprenorphine patch with intravenous tramadol for post-operative analgesia in laparotomy cases” (2017) Asian Journal of Pharmaceutical and Health Sciences, 7(1), pp. 1613–1617. Available at: https://www.ajphs.com/index.php/ajphs/article/view/306 (Accessed: 27 February 2026).