“Comparison of Ketamine, Fentanyl and Clonidine as an Adjuvant During Bupivacaine Caudal Anaesthesia in Paediatric Patients”, Kathmandu Univ. Med. J., vol. 10, no. 3, pp. 25–29, Apr. 2013, doi: 10.3126/kumj.v10i3.8013.