SZACHOŃ-PSZENNY, A. The borders of the Schengen area and the borders of the European Union - legal conditions. Border and Regional Studies, [S. l.], v. 6, n. 1, p. 51–75, 2018. DOI: 10.25167/ppbs379. Disponível em: https://czasopisma.uni.opole.pl/index.php/p/article/view/379. Acesso em: 2 nov. 2024.