M. Kumar, A. Kumar, D. Singh, and S. Saxena, “Prophylactic use of Midazolam, Ketamine, and Ketamine plus Midazolam for prevention of perioperative shivering during spinal anaesthesia in patients undergoing infraumbilical surgeries: a comparative study”, Int J Res Med Sci, vol. 5, no. 9, pp. 3985–3989, Aug. 2017.