“Comparison of Epidural Ropivacaine 0.75% and Ropivacaine 0.75% Plus Buprenorphine (0.5 Ml) for Total Knee Replacement Surgery”. 2017. International Journal of Biomedical and Advance Research 8 (6): 244-49. https://doi.org/10.7439/ijbar.v8i6.4259.