CASINILLO, L. F.; CASINILLO, E. L. Analyzing the difficulty level in learning mathematics online using a quantile regression approach. EDUCATUM Journal of Science, Mathematics and Technology, [S. l.], v. 10, n. 2, p. 38–46, 2023. DOI: 10.37134/ejsmt.vol10.2.5.2023. Disponível em: https://ojs.upsi.edu.my/index.php/EJSMT/article/view/8249. Acesso em: 20 may. 2024.