KUMAR, Vibha. Cascade Model for Online Discussion Boards in an E-Learning Environment. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 5, n. 1, p. pp. 48–50, 2010. DOI: 10.3991/ijet.v5i1.1049. Disponível em: https://online-journals.org/index.php/i-jet/article/view/1049. Acesso em: 2 may. 2024.