A. A. . Shah, “Intrathecal Fentanyl with Small-Dose Bupivacaine: Stable Hemodynamics in Geriatric Population Undergoing Orthopedic Surgery: Intrathecal Fentanyl with Small-Dose Bupivacaine”, PBMJ, vol. 5, no. 4, pp. 239–243, Apr. 2022.