Xu, X., Watanabe, K. and Nagai, I. 2021. Backstepping Control for a Tandem Rotor UAV Robot with Two 2-DOF Tiltable Coaxial Rotors. Journal of Robotics and Control (JRC). 2, 5 (Sep. 2021), 413–420. DOI:https://doi.org/10.18196/jrc.25116.