AMORIM, Marco; LOBO, António; COUTO, António. Tolling motorways in the time of economic downturn: the case of Portugal. Transport, [S. l.], v. 34, n. 2, p. 146–154, 2019. DOI: 10.3846/transport.2019.8581. Disponível em: https://journals.vilniustech.lt/index.php/Transport/article/view/8581. Acesso em: 16 may. 2025.