GÁL, Zoltán; RÁCZ, Szilárd. Border crossing in the Carpathian area. Discussion Papers, [S. l.], n. Special, p. 89–92, 2012. Disponível em: https://dp.ojs.rkk.hu/index.php/DP/article/view/2419. Acesso em: 15 apr. 2025.