Abdalilah Alhalangy, Osman Abdalla Mohamed Elhadi, and Eslam Hassan Gorshi Mohamed. 2025. “E-Learning Effectiveness and Efficiency in Kassala and Gedaref Universities: An IS-Impact Evaluation”. Utilitas Mathematica 122 (2):1301-17. https://utilitasmathematica.com/index.php/Index/article/view/2859.