Tran, Thi-Thao, Van-Truong Pham, and Dang-Thanh Bui. “A Variational Mode Decomposition-Based Approach for Heart Rate Monitoring Using Wrist-Type Photoplethysmographic Signals During Intensive Physical Exercise”. Old Journal, no. 131C (November 15, 2018): 100–104. Accessed August 2, 2025. https://jst.vn/index.php/old/article/view/710.