DE RIDDER, J. Who are you going to call? The future of the Universal Service Obligation. Journal of Telecommunications and the Digital Economy, [S. l.], v. 3, n. 4, p. 108–128, 2015. DOI: 10.18080/jtde.v3n4.27. Disponível em: https://mail.jtde.telsoc.org/index.php/jtde/article/view/27. Acesso em: 4 jul. 2024.