SØRENSEN, S. Tredjepartsalg af billetter til kollektiv trafik. Proceedings from the Annual Transport Conference at Aalborg University, [S. l.], v. 26, n. 1, 2019. DOI: 10.5278/ojs.td.v26i1.5090. Disponível em: https://journals.aau.dk/index.php/td/article/view/5090. Acesso em: 29 apr. 2024.