M. . Rahman, M. H. . Rahmn, M. Kamrujjaman, and M. S. Islam, “A comparative study of caudal epidural bupivacaine with bupivacaine plus fentanyl and bupivacaine plus neostigmine for anaesthesia and postoperative analgesia in children undergoing sub-umbilical surgeries”, j Bangladesh Soc Anaesthesiologists, vol. 32, no. 1, pp. 3–9, Feb. 2019.