Singh, R. B., Singh, D., Mishra, P. K., Kumar, M., & Kumar, V. (2017). Epidural ropivacaine combined with fentanyl or in combination with clonidine in infraumblical surgeries: a comparative study. International Journal of Research in Medical Sciences, 3(10), 2740–2744. https://doi.org/10.18203/2320-6012.ijrms20150824