Wan Haron, Wan Muhammad Azam, and Mohammad Nazib Adon. “Development of Electrocardiogram (ECG) Monitoring System Using IoT”. Evolution in Electrical and Electronic Engineering, vol. 4, no. 2, Oct. 2023, pp. 442-8, https://publisher.uthm.edu.my/periodicals/index.php/eeee/article/view/12727.