PAVLIDIS, Katerina; HAWKINS, Wayne. Affordability and 21st century telecommunications services. Journal of Telecommunications and the Digital Economy, [S. l.], v. 3, n. 2, p. 27–36, 2015. DOI: 10.18080/jtde.v3n2.10. Disponível em: https://mail.jtde.telsoc.org/index.php/jtde/article/view/10. Acesso em: 8 jan. 2025.