Aboelela, M. A., and A. K. Alrefaey. “Opioid Free Versus Opioid Based Anesthesia in Abdominal Gynecological Surgery: A Prospective Randomized Controlled Trial”. Anaesthesia, Pain & Intensive Care, Vol. 25, no. 5, Sept. 2021, pp. 653–659, doi:10.35975/apic.v25i5.1642.