CAMPBELL, I. 30 Years After Launch. Journal of Telecommunications and the Digital Economy, [S. l.], v. 5, n. 1, p. 4–40, 2017. DOI: 10.18080/jtde.v5n1.87. Disponível em: https://mail.jtde.telsoc.org/index.php/jtde/article/view/87. Acesso em: 6 jul. 2024.