ShresthaS K, and B Bhattarai. “Caudal Bupivacaine Vs Bupivacaine Plus Tramadol in Post-Operative Analgesia in Children”. Journal of Nepal Health Research Council00 (June 7, 2011). Accessed July 23, 2024. http://jnhrc.com.np/index.php/jnhrc/article/view/235.