HEDIN, Björn Olof. Mobile Message Services Using Text, Audio or Video for Improving the Learning Infrastructure in Higher Education. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 1, n. 1, 2006. DOI: 10.3991/ijet.v1i1.14. Disponível em: https://online-journals.org/index.php/i-jet/article/view/14. Acesso em: 3 may. 2024.