Zhao, Zengqun, Qingshan Liu, and Feng Zhou. “Robust Lightweight Facial Expression Recognition Network With Label Distribution Training”. Proceedings of the AAAI Conference on Artificial Intelligence 35, no. 4 (May 18, 2021): 3510-3519. Accessed April 23, 2024. https://ojs.aaai.org/index.php/AAAI/article/view/16465.