1. All About Heart Rate (Pulse). American Heart Association. 22 Aug 2017. Retrieved 25 Jan 2018.
2. Wikipedia contributors. "Blind signal separation." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 23 Jan. 2018. Web. 21 Feb. 2018.
3. Poh, M.Z., McDuff, D.J., Picard, R.W., "Advancements in Noncontact, Multiparameter Physiological Measurements Using a Webcam," IEEE Transactions on Biomedical Engineering, vol.58, no.1, pp. 7--11, Jan 2011
4. S. Kwon, H. Kim and K. S. Park, "Validation of heart rate extraction using video imaging on a built-in camera system of a smartphone," 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, San Diego, CA, 2012, pp. 2174--2177.
5. W. J. Jiang, S. C. Gao, P. Wittek and L. Zhao, "Real-time quantifying heart beat rate from facial video recording on a smart phone using Kalman filters," 2014 IEEE 16th International Conference on e-Health Networking, Applications and Services (Healthcom), Natal, 2014, pp. 393--396.