SPRENGEL, B. Borderland and security policy. Border and Regional Studies, [S. l.], v. 1, n. 1, p. 80, 2013. DOI: 10.25167/ppbs1077. Disponível em: https://czasopisma.uni.opole.pl/index.php/p/article/view/1077. Acesso em: 14 aug. 2025.