C.H., Murali, and Laxmi Narsaiah G. “Effects of Fentanyl on Isobaric Ropivacaine in Subarachnoid Anaesthesia for Lower Abdominal and Lower Extremity Surgeries”. International Journal of Research in Medical Sciences 4, no. 7 (January 3, 2017): 2850–2855. Accessed October 11, 2025. https://www.msjonline.org/index.php/ijrms/article/view/1019.