Hannallah, M., J. Carroll, A. Charabaty, C. Palese, F. Barton, and N. Haddad. “Comparison of Propofol Versus Propofol/Fentanyl Anesthesia”. Anaesthesia, Pain & Intensive Care, Vol. 22, no. 2, Jan. 2019, pp. 161-4, https://apicareonline.com/index.php/APIC/article/view/42.