CAMPBELL, Ian. Comments on the Two Historical Reprints in Automation of Directory Assistance. Journal of Telecommunications and the Digital Economy, [S. l.], v. 13, n. 3, 2025. DOI: 10.18080/jtde.v13n3.1340. Disponível em: https://mail.jtde.telsoc.org/index.php/jtde/article/view/1340. Acesso em: 26 oct. 2025.