Islam, M. Q., Begum, H., Akhtaruzzaman, A., & Khatun, U. S. (2009). Study on Efficacy of Nalbuphine Hydrochloride as Pre-Emptive Analgesic – Comparison With Diclofenac Sodium after Open Cholecystectomy. Journal of the Bangladesh Society of Anaesthesiologists, 20(2), 39–44. https://doi.org/10.3329/jbsa.v20i2.3989