Irfan Khan, Neelima Tandon, Manmohan Jindal, and Kushal Jethani. “To Evaluate the Efficacy of Magnesium Sulfate and Fentanyl As an Adjuvant to Ropivacaine in Supraclavicular Brachial Plexus Block for Post-Operative Pain Relief in the Upper Limb Surgeries: A Comparative Randomized Study”. Asian Journal of Medical Sciences, vol. 14, no. 2, Feb. 2023, pp. 67-73, doi:10.3126/ajms.v14i2.49660.