KOMORNICKI, T. EXTERNAL BORDER OF THE EUROPEAN UNION – PERMEABILITY, CO-OPERATION, PERSPECTIVES. Discussion Papers, [S. l.], n. Special, p. 89–103, 2012. Disponível em: https://discussionpapers.rkk.hu/index.php/DP/article/view/2379. Acesso em: 26 jun. 2022.