Sowmya Madihalli Janardhan Iyengar, et al. “Effect of Oral Premedication With Ivabradine on Surgical Field and Intraoperative Bleeding During Functional Endoscopic Sinus Surgeries: A Prospective, Randomized, and Placebo-Controlled Study”. Asian Journal of Medical Sciences, vol. 14, no. 3, Mar. 2023, pp. 84-89, https://nepjol.info./index.php/AJMS/article/view/47271.