MORTENSEN, Niels. Licitation af bustrafikken - danske erfaringer. Proceedings from the Annual Transport Conference at Aalborg University, [S. l.], v. 2, n. 1, 1995. DOI: 10.5278/ojs.td.v2i1.3877. Disponível em: https://journals.aau.dk/index.php/td/article/view/3877. Acesso em: 18 maio. 2024.