Aloufi, F., I. A.-H. Khalil, A. M. Abdelkader Elsayed, Y. Wardat, and A. AL-Otaibi. “Virtual Mathematics Education During COVID-19: An Exploratory Study of Teaching Practices for Teachers in Simultaneous Virtual Classes”. International Journal of Learning, Teaching and Educational Research, vol. 20, no. 12, Dec. 2021, pp. 85-113, http://ijlter.myres.net/index.php/ijlter/article/view/749.