Pathak, Nidhi, Tanmay Tiwari, Sweta Singh, Yogesh Kumar Manik, Vipin Kumar Dhama, and Subhash Dahiya. “A Clinical Comparative Study of Ropivacaine Versus Ropivacaine With Fentanyl by Continuous Epidural Infusion for Post-Operative Analgesia and Ambulation in Patients Undergoing Major Gynecological Surgery”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 7, no. 4 (March 27, 2018): 1561–1566. Accessed October 27, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/4495.