COWIE, J. Subsidy and Productivity in the Privatised British Passenger Railway. Economic Issues, [S. l.], v. 7, n. 1, p. 25–37, 2002. Disponível em: http://www.economicissues.org.uk/index.php/EI_OJS/article/view/83. Acesso em: 26 aug. 2026.