Syed Abid Ali, Gandhay Madhavi, Kota Raju, and Rontala Saraiah. “To Compare the Efficacy of Fentanyl Versus Dexmedetomidine As Adjuvant to 0.5% Bupivacaine in Ultrasound Guided Supraclavicular Brachial Plexus Block in Upper Limb Surgeries”. International Journal of Health and Clinical Research, vol. 4, no. 15, Aug. 2021, pp. 391-6, https://ijhcr.com/index.php/ijhcr/article/view/2566.