Evaluating E-learning Platforms for Schools: Use and Usability, User Acceptance, and Impact on Learning. - Lampros K. Stergioulas; Munir Abassi; Georgios Xydopoulos; Masoud Fakhimi; Ruxandra Margineanu; Luis E. Anido-Rifón; Manuel J. Fernández-Iglesias (ICALT, 2014)