Singh, J., Hamal, D., & Karmacharya, A. (2013). Comparision of Caudal Ropivacaine, Ropivacaine Plus Ketamine and Ropivacaine Plus Fentanyl Administration for Postoperative Analgesia in Children. Journal of Nepal Paediatric Society, 32(3), 210–215. https://doi.org/10.3126/jnps.v32i3.6956