“A Comparison of Fentanyl and Clonidine As Adjuvants to Intrathecal Levobupivacaine for Spinal Anaesthesia and Postoperative Analgesia in Patients Undergoing for Lower Limb Surgery”. International Journal of Biomedical Research 9, no. 2 (March 3, 2018): 76–80. Accessed March 17, 2026. https://www.ssjournals.co.in/index.php/ijbr/article/view/4622.