- https://andykong.org/blog/PPG_tutorial/
- https://github.com/giladoved/webcam-heart-rate-monitor
- https://betterprogramming.pub/face-tracking-with-javascript-on-any-device-with-a-browser-mobile-or-desktop-48aa561fd9d5
- Verkruysse, W., Svaasand, L. O., & Nelson, J. S. (2008). Remote plethysmographic imaging using ambient light. Optics express, 16(26), 21434–21445.
- Hao-Yu Wu, Michael Rubinstein, Eugene Shih, John Guttag, Frédo Durand, and William Freeman (2012). Eulerian video magnification for revealing subtle changes in the world. ACM Transactions on Graphics (TOG), 31, 1 - 8.