Shrestha, C., Sharma, K. and Shrestha, R. (2007) “Comparative study of epidural administration of 10 ml of 0.1% bupivacaine with 2 mg butorphanol and 10 ml of 0.25% plain bupivacaine for analgesia during labor”, Journal of Nepal Medical Association, 46(165). doi: 10.31729/jnma.409.