PINTO, Nuno Gama de Oliveira. The E-Government and the New Challenges of the European Single Market. Journal of Information Systems and Technology Management, [S. l.], v. 6, n. 1, p. 111–115, 2009. DOI: 10.4301/s1807-17752009000100006. Disponível em: https://jistem.tecsi.org/index.php/jistem/article/view/10.4301%252FS1807-17752009000100006. Acesso em: 13 jul. 2025.