Lopez, D. P., F. Z. Canal, G. G. Scotton, E. Pozzebon, and A. C. Sobieranski. “A Real-Time Computational Approach for Human Facial Expression Recognition Based on Landmark Feature Extraction”. Seven Editora, Apr. 2024, pp. 73-93, https://sevenpublicacoes.com.br/editora/article/view/4046.