Kumar, Vinay. 2020. “Study of Intrathecal Dexmedetomidine and Fentanyl As an Supporting to Isobaric Levobupivacaine for Lower Limb Orthopaedic Surgery”. International Journal of Health and Clinical Research 3 (4):97-102. https://www.ijhcr.com/index.php/ijhcr/article/view/135.