eAnalytics: a model of a learning analytics visualization system. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 109, p. 99–119, 2022. DOI: 10.60063/gsu.fmi.109.99-119. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/555. Acesso em: 14 dec. 2025.