Ahmed, R., M. S. A. Shaheen, P. K. Sarker, S. P. Roy, and M. N. A. Alam. “Comparative Study of Dexmedetomidine and Fentanyl As an Adjuvant to Epidural Bupivacaine for Post-Operative Pain Relief in Hepato-Biliary Pancreatic Surgery”. Anwer Khan Modern Medical College Journal, vol. 10, no. 2, Nov. 2019, pp. 143-9, doi:10.3329/akmmcj.v10i2.44127.