Ahmed, N. U., Hossain, M., Akhtaruzzaman, A., Mondol, M. K. and Khatun, U. S. (2014) “Addition of clonidine or fentanyl with bupivacaine for supraclavicular brachial plexus blocks in upper limb surgery - a randomized comparative study”, Journal of the Bangladesh Society of Anaesthesiologists, 24(1), pp. 3–7. doi: 10.3329/jbsa.v24i1.19792.