Sylvester, S. S., E. L. M. Su, C. F. Yeong, and F. K. Che Harun. “Miniaturized and Wearable Electrocardiogram (ECG) Device With Wireless Transmission”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 3-9, Dec. 2017, pp. 15-19, https://jtec.utem.edu.my/jtec/article/view/3117.