Wannasunthornchai, P., A. Polsri, and M. Songthamwat. “Efficacy of Post Total Knee Arthroplasty Pain Control by Adductor Canal Block plus Morphine Around the Clock versus Adductor Canal Block plus Patient Control Analgesia Intravenous Morphine: a Randomized Controlled Trial”. Thai Journal of Anesthesiology, vol. 49, no. 2, Feb. 2023, pp. 101-8, https://he02.tci-thaijo.org/index.php/anesthai/article/view/261529.