V. S. S. N. Murthy, N. Hari Kiran Verma, and A. Acharya, “A randomised prospective comparative study of evaluation of dexmedetomidine an adjuvant to ropivacaine for ultrasound guided supraclavicular block”, Int J Clin Trials, vol. 5, no. 3, pp. 127–131, Jul. 2018.