Fearnley, Nils, y Jon-Terje Bekken. «Performance-Based Subsides: An Alternative Subsidy Regime for Passenger Rail Transport». Proceedings from the Annual Transport Conference at Aalborg University 10, no. 1 (diciembre 31, 2003). Accedido julio 3, 2024. https://journals.aau.dk/index.php/td/article/view/4617.