PODSIADŁO, Piotr. Tax Subsidies and State Aid in the European Union. Central and Eastern European Economic Review, Kraków, Poland, n. 12, p. 103–120, 2015. DOI: 10.15678/AOC.2015.1208. Disponível em: https://ceeer.uek.krakow.pl/index.php/aoc/article/view/608. Acesso em: 27 jun. 2026.