ABDALILAH ALHALANGY; OSMAN ABDALLA MOHAMED ELHADI; ESLAM HASSAN GORSHI MOHAMED. E-Learning Effectiveness and Efficiency in Kassala and Gedaref Universities: An IS-Impact Evaluation. Utilitas Mathematica , [S. l.], v. 122, n. 2, p. 1301–1317, 2025. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/2859. Acesso em: 7 may. 2026.