F. Zainab, M. O. Faruq, M. Talukder, S. Yeasmeen, A. S. Alam, and A. F. Haque, “Anaesthetic and analgesic eects of adding fentanyl to bupivacaine-lignocaine mixtures in supraclavicular brachial plexus block – a comparative study with or without fentanyl”, Bangladesh Med J, vol. 44, no. 1, pp. 26–31, Jan. 2016.