KRAŚNICKA, I.; PERKOWSKA, M.; WROŃSKA, I. Free movement of persons between Switzerland and the European Union and state security. Przegląd Politologiczny, [S. l.], n. 3, p. 59–75, 2014. DOI: 10.14746/pp.2014.19.3.5. Disponível em: https://pressto.amu.edu.pl/index.php/pp/article/view/2912. Acesso em: 6 luty. 2023.