PupilHeart: Heart Rate Variability Monitoring via Pupillary Fluctuations on Mobile Devices. Int J Sci Res Sci & Technol [Internet]. 2025 May 19 [cited 2025 Aug. 10];12(3):339-42. Available from: https://mail.ijsrst.com/index.php/home/article/view/IJSRST2512339