BOUIHI, B.; BAHAJ, M. Ontology and Rule-Based Recommender System for E-learning Applications. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 14, n. 15, p. pp. 4–13, 2019. DOI: 10.3991/ijet.v14i15.10566. Disponível em: https://online-journals.org/index.php/i-jet/article/view/10566. Acesso em: 16 jan. 2022.