Kucuk, N., A. Yasar, and S. Uslu. “The Effectiveness of Intranasal Fentanyl and Intravenous Ketorolac Tromethamine Combination for Postoperative Analgesia”. Annals of Medical Research, vol. 4, no. 3, May 2021, pp. 0279-81, https://www.annalsmedres.org/index.php/aomr/article/view/2624.