P. Verhoest, Telecommunicatie en beleid in België 1830-1991. BMGN - Low Countries Historical Review, [S. l.], v. 109, n. 1, p. 97–98, 1994. DOI: 10.18352/bmgn-lchr.3801. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104371.. Acesso em: 30 jun. 2024.