LABORI, José. Difficulty index and active learning in Education 4.0 applied to university education. Revista Innova Educación, [S. l.], v. 5, n. 3, p. 129–144, 2023. DOI: 10.35622/j.rie.2023.03.008. Disponível em: https://revistas.inudi.edu.pe/rie/article/view/1268. Acesso em: 7 jul. 2026.