HELBERG, N. Det kommunale sortpletarbejde - muligheder og begrænsninger. Proceedings from the Annual Transport Conference at Aalborg University, [S. l.], v. 10, n. 1, 2003. DOI: 10.5278/ojs.td.v10i1.4703. Disponível em: https://journals.aau.dk/index.php/td/article/view/4703. Acesso em: 4 may. 2024.