Akrity Singh, and Harinandan Prasad. “Comparative Study of Duration of Analgesia With Epidural Bupivacaine & Bupivacaine With Tramadol in Lower Limb and Lower Abdominal Surgeries”. International Journal of Drug Delivery 5, no. 2 (June 30, 2013): 239–244. Accessed December 4, 2024. https://ijdd.arjournals.org/index.php/ijdd/article/view/202.