B. Kallapur, Y. H. S., and S. I. Sheikh, “A prospective randomised double-blind study of comparison of efficacy and safety of dexmedetomidine and clonidine as adjuvants to intrathecal isobaric ropivacaine 0.75% in lower limb surgeries”, Int J Res Med Sci, vol. 7, no. 3, pp. 711–716, Feb. 2019.