Ashish Mohan M, et al. “Pulse Oximeter Perfusion Index As a New Predictor of Hypotension Following Subarachnoid Block in Lower Segment Cesarean Section: A Prospective Randomized Study”. Asian Journal of Medical Sciences, vol. 16, no. 2, Feb. 2025, pp. 31-37, https://nepjol.info/index.php/AJMS/article/view/71353.