Anuj Malik, Gaurav Gupta, Kamal Bagdi, Ranjeet Singh Virk, and Uma Rathi. “To Deduce Optimal Fentanyl Infusion Dose for Effective Analgesia With Minimal Side Effects and Maximum Hemodynamic Stability”. Indian Journal Of Clinical Practice, vol. 30, no. 11, Apr. 2020, pp. 1056-9, https://ojs.ijcp.in/IJCP/article/view/832.