Sukantarat, N., and K. Uthaiwan. “Comparison of Postoperative Pain Scores between Intraoperative Intravenous Ketamine and Placebo in Patients Undergoing Unilateral Total Knee Arthroplasty under General Anesthesia: a Double-blind Randomized Controlled Trial”. Thai Journal of Anesthesiology, vol. 51, no. 3, May 2025, pp. 157-66, https://he02.tci-thaijo.org/index.php/anesthai/article/view/275222.