GUDMUNDSSON, H. Performance planning indikatorer for transport og miljø i USA og Canada. Proceedings from the Annual Transport Conference at Aalborg University, [S. l.], v. 8, n. 1, 2001. DOI: 10.5278/ojs.td.v8i1.4785. Disponível em: https://journals.aau.dk/index.php/td/article/view/4785. Acesso em: 5 may. 2024.