KHODIER, N.; ELAZHARY, H.; WANAS, N. Rule-based Cognitive Modeling and Model Tracing in a Math Story Problem Tutor. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 12, n. 04, p. pp. 111–125, 2017. DOI: 10.3991/ijet.v12i04.6592. Disponível em: https://online-journals.org/index.php/i-jet/article/view/6592. Acesso em: 22 jan. 2022.