Todorova, K. (2008) “Modeling and design of learning content management systems: UML as a tool for learning system design”, Ann. Sofia Univ. Fac. Math. and Inf, 98, pp. 231–242. Available at: https://ftl5.uni-sofia.bg./index.php/fmi/article/view/140 (Accessed: 24 November 2024).