Comparison of epidural Ropivacaine 0.75% and Ropivacaine 0.75% Plus Buprenorphine (0.5 ml) for total knee replacement surgery. International Journal of Biomedical and Advance Research, [S. l.], v. 8, n. 6, p. 244–249, 2017. DOI: 10.7439/ijbar.v8i6.4259. Disponível em: https://www.ssjournals.co.in/index.php/ijbar/article/view/4259. Acesso em: 17 jun. 2026.