EKSTRĂ–M, J. Finding second-best toll locations and levels by relaxing the set of first-best feasible toll vectors. European Journal of Transport and Infrastructure Research, [S. l.], v. 14, n. 1, 2014. DOI: 10.18757/ejtir.2014.14.1.3013. DisponĂ­vel em: https://journals.open.tudelft.nl/ejtir/article/view/3013. Acesso em: 16 jan. 2022.