Ajay Babu Ramakrishnan, S. Ankalagowri Sankardevar, Nischala Reddy G, and Uthkala B Hegde, “Epidural Fentanyl and Fentanyl Plus Magnesium for Post-Operative Analgesia in Lower Extremity Surgery”, AAN, vol. 5, no. 2, pp. 35-38, Dec. 2020.