WOJNICKA, E. Regional Diversification of Grey Area in Poland. Regional Barometer. Analyses & Prognoses, [S. l.], n. 1 (15), p. 27–34, 2009. DOI: 10.56583/br.1421. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1421. Acesso em: 22 nov. 2024.