CALVO, Ángel. Autochthonous technology and oligopoly in the telecommunications sector: Amper, 1980-2003. Revista de Historia Industrial — Industrial History Review, [S. l.], v. 29, n. 79, p. 165–202, 2020. DOI: 10.1344/rhi.v29i79.31060. Disponível em: https://revistes.ub.edu/index.php/HistoriaIndustrial/article/view/31060. Acesso em: 19 aug. 2024.