Khong, W. L., N. S. V. Kameswara Rao, M. Mariappan, and M. Nadarajan. “Analysis of Heart Beat Rate through Video Imaging Techniques”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 8, no. 11, Dec. 2016, pp. 69-74, https://jtec.utem.edu.my/jtec/article/view/1412.