Gupta, Arushi, Tanmay Tiwari, Rajni Kapoor, Anita Malik, Haider Abbas, and Prem Raj Singh. “Comparative Study of Ropivacaine With Ropivacaine-Fentanyl and Ropivacaine-Fentanyl- Magnesium Sulfate in Epidural Anesthesia for Lower Limb Surgeries”. International Surgery Journal 5, no. 4 (March 23, 2018): 1300–1305. Accessed November 26, 2025. https://www.ijsurgery.com/index.php/isj/article/view/2768.