Siddiq, S., Asad, N., Rehman, A., Ali, M., Khalid, H.M.U. and Butt, Z. 2019. A comparative study of the effect of intrathecal tramadol and buprenorphine used as adjuvants to hyperbaric bupivacaine for postoperative analgesia in infraumbilical surgeries. Anaesthesia, Pain & Intensive Care. 23, 3 (Dec. 2019), 263-267. DOI:https://doi.org/10.35975/apic.v23i3.1133.