Taneja, Ashima, Kamaldeep Arora, Isha Chopra, Anju Grewal, Sushree Samiksha Naik, and Geetika Sharma. “Fetomaternal Outcome in High-Risk Parturients Receiving Epidural Analgesia Using Fentanyl With Ropivacaine Versus Iv Tramadol: A Comparative Study”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 6, no. 7 (June 24, 2017): 2836–2840. Accessed October 7, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/3052.