Saad Kamel, Hayder, et al. “Fentanyl Versus Tramadol As a Supraclavicular Brachial Plexus Blockade (BPB)”. International Journal of Psychosocial Rehabilitation, vol. 25, no. 3, June 2021, pp. 717-23, https://doi.org/10.61841/jewrb111.