“Automatic Facial Emotion Recognition Systems: Methods, Challenges, and Future Directions: A Study Based on Review”, Adv. Sci. Eng. Soc., vol. 1, no. 1, pp. 19–30, Mar. 2026, Accessed: Apr. 18, 2026. [Online]. Available: https://nkpublishers.com/index.php/nk/article/view/2