WIEDERKEHR, P.; GILBERT, R.; CRIST, P.; CAÏD, N. Environmentally Sustainable Transport (EST): Concept, Goal, and Strategy – The OECD’s EST Project. European Journal of Transport and Infrastructure Research, [S. l.], v. 4, n. 1, 2004. DOI: 10.18757/ejtir.2004.4.1.4254. Disponível em: https://journals.open.tudelft.nl/ejtir/article/view/4254. Acesso em: 30 nov. 2023.