STANKUNAS, J.; ZILIENE, D. Unmanned air vehicle flights within airspace. Proceedings of National Aviation University, [S. l.], v. 17, n. 2, p. 77–79, 2003. DOI: 10.18372/2306-1472.2.11919. Disponível em: https://jrnl.nau.edu.ua/index.php/visnik/article/view/11919. Acesso em: 27 apr. 2024.