Hendarman, Iman, Silvia Triratna, Muhammad Kamaludin, and Theodorus Theodorus. 2014. “Ketorolac Vs. Tramadol for Pain Management After Abdominal Surgery in Children”. Paediatrica Indonesiana 54 (2), 118-21. https://doi.org/10.14238/pi54.2.2014.118-21.