ECHKALO, Yu. V. Elements of a mobile learning environment. CTE Workshop Proceedings, Kryvyi Rih, Ukraine, v. 2, p. 152–157, 2014. DOI: 10.55056/cte.199. Disponível em: https://acnsci.org/journal/index.php/cte/article/view/199.. Acesso em: 27 jun. 2026.