Zainab, F. et al. 2016. Anaesthetic and analgesic eects of adding fentanyl to bupivacaine-lignocaine mixtures in supraclavicular brachial plexus block – a comparative study with or without fentanyl. Bangladesh Medical Journal. 44, 1 (Jan. 2016), 26–31. DOI:https://doi.org/10.3329/bmj.v44i1.26348.