TRANKJÆR, C.; NAUTRUP, L. The X Factor of Public Transport. Proceedings from the Annual Transport Conference at Aalborg University, [S. l.], v. 18, n. 1, 2011. DOI: 10.5278/ojs.td.v1i1.5560. Disponível em: https://journals.aau.dk/index.php/td/article/view/5560. Acesso em: 3 may. 2024.