BECK, A. Barriers to Entry in Rail Passenger Services: Empirical Evidence for Tendering Procedures in Germany. European Journal of Transport and Infrastructure Research, [S. l.], v. 11, n. 1, 2011. DOI: 10.18757/ejtir.2011.11.1.2908. Disponível em: https://journals.open.tudelft.nl/ejtir/article/view/2908. Acesso em: 16 jan. 2022.