Chompubai, P., S. Pichayaphan, and C. Wongsuwan. “Efficacy of Patient-Administered Oral Analgesia after Elective Cesarean Section”. Thai Journal of Anesthesiology, vol. 51, no. 5, Aug. 2025, pp. 329-38, https://he02.tci-thaijo.org/index.php/anesthai/article/view/277307.