RUNHAAR, H. Efficient Pricing in Transport. European Journal of Transport and Infrastructure Research, [S. l.], v. 1, n. 1, p. 29–44, 2001. DOI: 10.18757/ejtir.2001.1.1.1867. Disponível em: https://journals.open.tudelft.nl/ejtir/article/view/1867. Acesso em: 9 aug. 2022.