Nguyen Hoang, Dung. “An IoT-Based Heart Rate and SpO₂ Wearable Device for Centralized Patient Monitoring in Viet Nam: Design and Preliminary Assessment”. Smart Systems and Devices 36, no. 3 (June 30, 2026). Accessed September 22, 2026. https://jst.vn/index.php/ssad/article/view/1393.