H. M. Azman and R. Omar, “Swimming Health Monitoring System with Heartbeat and Oxygen Sensor”, EEEE, vol. 4, no. 1, pp. 79–86, May 2023, Accessed: Jul. 18, 2024. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/10142