Nayak, S. P., Dhar, R., & Mohanty, D. (2016). Total knee replacement: a randomized study of clonidine and dexmedetomidine used for epidural postoperative analgesia. International Journal of Research in Orthopaedics, 3(1), 134–139. https://doi.org/10.18203/issn.2455-4510.IntJResOrthop20164838