KOWALIK, J.; ZAWADA, M.; KUCĘBA, R. REGIONAL DIVERSIFICATION OF THE LEVEL OF ECONOMIC DEVELOPMENT IN POLAND. PEOPLE: International Journal of Social Sciences, [S. l.], v. 3, n. 2, p. 730–745, 2017. DOI: 10.20319/pijss.2017.32.730745. Disponível em: https://grdspublishing.org/index.php/people/article/view/1014. Acesso em: 4 dec. 2024.