Singh, J., R. Shah, N. Vaidya, P. Mahato, S. Shrestha, and B. Shrestha. “Comparison of Ketamine, Fentanyl and Clonidine As an Adjuvant During Bupivacaine Caudal Anaesthesia in Paediatric Patients”. Kathmandu University Medical Journal, vol. 10, no. 3, Apr. 2013, pp. 25-29, doi:10.3126/kumj.v10i3.8013.