H. Hemlata, J. Agarwal, D. Singh, and S. . Verma, “Dexmedetomidine and Fentanyl as an Adjuvant to Intrathecal Isobaric Ropivacaine for Surgery of Fracture Neck Femur; A Randomized, Double-Blind Comparison”, J Cell Mol Anesth, vol. 8, no. 1, pp. 22–30, Jun. 2022.