HELMICH, Martin. STATIC TESTS OF UNCONVENTIONAL PROPULSION UNITS FOR ULTRALIGHT AIRPLANES. Acta Polytechnica, Prague, Czech Republic, v. 54, n. 3, p. 183–190, 2014. DOI: 10.14311/AP.2014.54.0183. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/2125. Acesso em: 2 apr. 2025.