STELMACH-FITA, Beata. Smart Cities and U-space. Preparing for UAV operations in urban airspace. Bulletin of Geography. Socio-economic Series, [S. l.], n. 70, p. 19–42, 2025. DOI: 10.12775/bgss-2025-0037. Disponível em: https://apcz.umk.pl/BGSS/article/view/61316. Acesso em: 28 dec. 2025.