Sowmya Madihalli Janardhan Iyengar, Shankar Kantharaju, and Shubha Mysore Ramesh, “Efficacy of intraoperative subanaesthetic dose of ketamine on post-operative analgesia for patients undergoing single level lumbar discectomy under general anesthesia: A placebo control randomized clinical study”, Asian J Med Sci, vol. 14, no. 11, pp. 53–59, Nov. 2023.