Pradhan, Akshay Prasad, et al. “Prediction of Hypotension Using Perfusion Index Following Spinal Anesthesia in Lower Segment Caesarean Section”. Nepal Journal of Obstetrics and Gynaecology, vol. 15, no. 2, Nov. 2020, https://nepjol.info/index.php/NJOG/article/view/32909.