Dipro Dey, P. Selvamani. “Comparitive Study of Epidural Fentanyl and Bupivacaine With Epidural Clonidine and Bupivacaine for Post Operative Pain Relief in Lower Abdominal and Lower Limb Surgeries- A Randomised Controlled Trial”. Annals of the Romanian Society for Cell Biology, Mar. 2021, pp. 3813-28, http://annalsofrscb.ro/index.php/journal/article/view/1870.