RÓNAI, Péter. Marginal Cost Calculations and Price Discrimination in the Railway Freight Sector. Periodica Polytechnica Transportation Engineering, [S. l.], v. 31, n. 1-2, p. 79–88, 2003. Disponível em: https://pp.bme.hu/tr/article/view/1938. Acesso em: 25 nov. 2024.