A. P. Varghese and S. M. Kurian, “Advancements in ECG Heartbeat Classification: A Comprehensive Review of Deep Learning Approaches and Imbalanced Data Solutions”, IJERA, vol. 3, no. 2, Dec. 2023, Accessed: Jul. 05, 2025. [Online]. Available: https://ijera.in/index.php/IJERA/article/view/7