COLE, S.; HOLVAD, T. Socially Necessary Rail Services. Proceedings from the Annual Transport Conference at Aalborg University, [S. l.], v. 6, n. 1, 1999. DOI: 10.5278/ojs.td.v6i1.4381. Disponível em: https://journals.aau.dk/index.php/td/article/view/4381. Acesso em: 7 may. 2024.