Singh, M., Arya, A. K., Goyal, R., & Rautela, R. S. (2019). A double blind, randomized, controlled study of the effect of addition of butorphanol to 0.25% bupivacaine for bilateral ilioinguinal nerve blocks in post-caesarean patients. Anaesthesia, Pain & Intensive Care, 76-81. Retrieved from https://mail.apicareonline.com/index.php/APIC/article/view/539