“Fentanyl and Dexmedetomidine with Bupivacaine in Spinal Block for Post Operative Analgesia in lower limb Orthopaedic Surgery : A comparative study”, AJPHS, vol. 6, no. 2, pp. 1453–1460, Jun. 2016, Accessed: Feb. 27, 2026. [Online]. Available: https://www.ajphs.com/index.php/ajphs/article/view/375