Bhargava, Sumit, Aparna Tamaskar, Nupur Chakravarty, Seema Shende, and Ramchandra Vinayak Shidhaye. “Comparative Study of Thoracic Epidural Fentanyl With Sufentanil for Postoperative Pain Relief in Thoracic Surgery”. Anaesthesia, Pain & Intensive Care (January 29, 2019): 260-264. Accessed July 3, 2024. https://apicareonline.com/index.php/APIC/article/view/436.