HELMICH, Martin. STATIC TESTS OF UNCONVENTIONAL PROPULSION UNITS FOR ULTRALIGHT AIRPLANES. Acta Polytechnica, [S. l.], v. 54, n. 3, p. 183–190, 2014. DOI: 10.14311/AP.2014.54.0183. Disponível em: https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/2125.. Acesso em: 12 may. 2025.