“Manifold-Constrained Data Augmentation via SPD Geometry for Self-Supervised ECG Representation Learning”, J. Adv. Intell. Comput. Inform., vol. 1, no. 1, pp. 1–15, Sep. 2026, Accessed: Oct. 07, 2026. [Online]. Available: https://landing.wrunion.org/ojs/index.php/jaici/article/view/19