HUANG, Y.; ZHU, J. A Personalized English Learning Material Recommendation System Based on Knowledge Graph. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 16, n. 11, p. pp. 160–173, 2021. DOI: 10.3991/ijet.v16i11.23317. Disponível em: https://online-journals.org/index.php/i-jet/article/view/23317. Acesso em: 8 aug. 2022.