F. Soares, C. Machado, D. Diniz, A. Maciel, and R. Rodrigues. " Educational Data Mining to support Distance Learning students with difficulties in the Portuguese Grammar", in Anais do XXVII Simpósio Brasileiro de Informática na Educação, Uberlândia/MG, 2016, pp. 956-965, doi: https://doi.org/10.5753/cbie.sbie.2016.956.