BRABEC, Jiří; HELMICH, Martin. Development of an Ultralight with a Ducted Fan. Acta Polytechnica, Prague, Czech Republic, v. 52, n. 5, 2012. DOI: 10.14311/1624. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/1624. Acesso em: 2 apr. 2025.