Naim Ismail Imunu, Isngadi, Rudy Vitraludyono, and Arie Zainul Fatoni, “Evaluation of Morphine-Sparing Efficacy with Low-Dose Ketamine in Pediatric Postoperative Pain: A Pilot Randomized Controlled Trial”, OAIJMR, vol. 6, no. 1, pp. 63-74, Dec. 2025.