Regmi, N.K. et al. 2017. A Comparative Clinical Evaluation of Efficacy of Tramadol As An Adjuvant To Bupivacaine En Brachial Plexus Block For Upper Limb Surgery. Journal of Nepalgunj Medical College. 13, 2 (Feb. 2017), 13–16. DOI:https://doi.org/10.3126/jngmc.v13i2.16535.