Sahar, N. S., N. A. Abdul-Kadir, W. H. Chan, E. L. M. Su, and F. K. Che Harun. “Wireless ECG Circuit on Flexible Material: A Preliminary Study”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 10, no. 1-17, May 2018, pp. 43-46, https://jtec.utem.edu.my/jtec/article/view/4162.