BRABEC, J.; HELMICH, M. Development of an Ultralight with a Ducted Fan. Acta Polytechnica, [S. l.], v. 52, n. 5, 2012. DOI: 10.14311/1624. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/1624. Acesso em: 3 may. 2024.