1. Raptis, I.A., Valavanis, K.P., Moreno, W.A.: A novel nonlinear backstepping controller design for helicopters using the rotation matrix. IEEE Trans. Control Syst. Technol. 19(2), 465–473 (2011)
2. Ahmed, B., Pota, H.R., Garratt, M.: Flight Control of a rotary wing UAV using backstepping. Int. J. Robust Nonlinear Control 20(6), 639–658 (2010)
3. Lee, C., Tsai, C.: Improvement in trajectory tracking control of a small scale helicopter via backstepping. In: Proc. Inter. Conf. Mechatronics, pp. 1–6 (2007)
4. Frazzoli, E., Dahleh, M.A., Feron, E.: Trajectory tracking control design for autonomous helicopters using a backstepping algorithm. In: Proc. American Ctrl. Conf, pp. 4102–4107 (2000)
5. Zhu, B., Huo, W.: Adaptive backstepping control for a miniature autonomous helicopter. In: Proc. of 2011 50th IEEE Conf. Decis. and Ctrl. and Euro. Ctrl. Conf, pp. 5413–5418 (2011)