Brodnik, Andrej, Hakan Jonsson, Pier Giuseppe Rossi, and Carlo Tasso. “Interoperability and Semantic Filtering”. Journal of e-Learning and Knowledge Society 2, no. 2 (October 9, 2012). Accessed June 3, 2025. http://je-lks.org/ojs/index.php/Je-LKS_EN/article/view/711.