PTAK, Michał. MOTOR FUEL TAXES AND THE ENVIRONMENTAL PROTECTION. Oeconomia Copernicana, [S. l.], v. 2, n. 1, p. 29–48, 2011. DOI: 10.12775/OeC.2011.002. Disponível em: https://apcz.umk.pl/OeC/article/view/OeC.2011.002. Acesso em: 8 jul. 2025.