VERRON, Hedwig; FRIEDRICH, Axel. Environmentally Sustainable Transport in Germany. European Journal of Transport and Infrastructure Research, [S. l.], v. 4, n. 1, 2004. DOI: 10.18757/ejtir.2004.4.1.4257. Disponível em: https://journals.open.tudelft.nl/ejtir/article/view/4257. Acesso em: 17 jun. 2024.