XU, X.; WATANABE, K.; NAGAI, I. Backstepping Control for a Tandem Rotor UAV Robot with Two 2-DOF Tiltable Coaxial Rotors. Journal of Robotics and Control (JRC), [S. l.], v. 2, n. 5, p. 413–420, 2021. DOI: 10.18196/jrc.25116. Disponível em: https://journal.umy.ac.id/index.php/jrc/article/view/10581. Acesso em: 5 oct. 2025.