KUKHARENKO, V. M. Problems of massive open online distance learning courses in distance learning systems. CTE Workshop Proceedings, Kryvyi Rih, Ukraine, v. 1, p. 55–56, 2013. DOI: 10.55056/cte.89. Disponível em: https://acnsci.org/journal/index.php/cte/article/view/89.. Acesso em: 23 may. 2025.