CZAPLICKI, K. SCHENGEN INFORMATION SYSTEM (SIS). GIS Odyssey Journal, [S. l.], v. 1, n. 2, p. 123–130, 2021. DOI: 10.57599/gisoj.2021.1.2.123. Disponível em: https://www.gisjournal.us.edu.pl/index.php/gis-odyssey-journal/article/view/33. Acesso em: 12 mar. 2025.