GOŁDYN, Anna. The Impact of the Grey Zone on the Economy in Poland. Central and Eastern European Economic Review, Kraków, Poland, n. 1-2(24-25), p. 93–103, 2023. DOI: 10.15678/AOC.2021.2406. Disponível em: https://ceeer.uek.krakow.pl/index.php/aoc/article/view/2261. Acesso em: 29 jun. 2026.