Singh, Y., A. Yadav, V. Bajpai, P. Diwedi, S. Verma, and R. Verma. “Comparison of Intrathecal Fentanyl and Buprenorphine As Adjuvants to Bupivacaine in Gynecological Surgery”. Anaesthesia, Pain & Intensive Care, Vol. 26, no. 1, Feb. 2022, pp. 39-43, doi:10.35975/apic.v26i1.1764.