REN, Zhuoyue. Facial expression classification. Highlights in Science, Engineering and Technology, [S. l.], v. 41, p. 43–52, 2023. DOI: 10.54097/hset.v41i.6741. Disponível em: https://drpress.org/ojs/index.php/HSET/article/view/6741. Acesso em: 31 aug. 2026.