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Comparison of epidural Ropivacaine 0.75% and Ropivacaine 0.75% Plus Buprenorphine (0.5 ml) for total knee replacement surgery. Int J of Biomed & Adv Res [Internet]. 2017 Jun. 28 [cited 2026 Mar. 13];8(6):244-9. Available from: https://ssjournals.co.in/index.php/ijbar/article/view/4259