Loo, Chze Xin, Sumendra Yogarayan, and Siti Fatimah Abdul Razak. “Real-Time Heart Rate Classification: Advancements and Challenges”. Journal of Engineering Technology and Applied Physics 6, no. 1 (March 15, 2024): 40–45. Accessed April 21, 2025. https://journals.mmupress.com/index.php/jetap/article/view/669.