THOMAS, R. Contact-ability framework for the delivery of universal services. Journal of Telecommunications and the Digital Economy, [S. l.], v. 3, n. 4, p. 140–154, 2015. DOI: 10.18080/jtde.v3n4.30. Disponível em: https://jtde.telsoc.org/index.php/jtde/article/view/30. Acesso em: 27 nov. 2024.