Akrity Singh, Harinandan Prasad. Comparative study of duration of analgesia with epidural bupivacaine & bupivacaine with tramadol in lower limb and lower abdominal surgeries. ijdd [Internet]. 2013 Jun. 30 [cited 2024 Oct. 6];5(2):239-44. Available from: https://ijdd.arjournals.org/index.php/ijdd/article/view/202