MARAM ADIL ALI ALAZIZ. A Survey on Virtual Classroom System for Online Training. International Journal of Computer Engineering in Research Trends, [S. l.], v. 4, n. 1, p. 1–3, 2017. Disponível em: https://www.ijcert.org/index.php/ijcert/article/view/318. Acesso em: 21 may. 2026.