Bevilacqua, Luca, Nicola Capuano, Annunziata Cascone, Federico Ceccarini, Fabio Corvino, Ciro D’Apice, Ivano De Furio, Giovanna Scafuro, and Gianluca Supino. “Advanced User Interfaces for E-Learning”. Journal of e-Learning and Knowledge Society 5, no. 3 (December 21, 2009). Accessed November 30, 2021. http://je-lks.org/ojs/index.php/Je-LKS_EN/article/view/213.