F. Khan and V. P. Singh, “A comparative study of intravenous versus perineural administration of dexmedetomidine in supraclavicular brachial plexus block using 0.75% ropivacaine by ultrasound guided technique in upper limb surgeries”, Int J Res Med Sci, vol. 6, no. 7, pp. 2407–2413, Jun. 2018.