Islam, M. Q., Begum, H., Akhtaruzzaman, A. and 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), pp. 39–44. doi: 10.3329/jbsa.v20i2.3989.