Sebastián G, Tesoriero R, Gallud JA. Unified Abstract Mechanism to Model Language Learning Activities. Comput. Inform. [Internet]. 2021 Oct. 12 [cited 2024 Nov. 22];40(2):249–276. Available from: http://147.213.75.17/ojs/index.php/cai/article/view/2021_2_249