1. Spanoudakis, P., Tsourveloudis, N.C., Valavanis, K.P.: Design specifications for an unmanned VTOL. In: Proceedings of the 2004 IEEE International Conference on Robotics and Automation, pp. 3616–3621. IEEE Society, New Orleans (2004)
2. Do, K.D., Jiang, Z.P., Pan, J.: Global output feedback tracking control of a VTOL aircraft. In: Proceedings of the 42th IEEE Conference on Decision and Control, pp. 4914–4919. IEEE Society, Hawaii (2003)
3. Xue, P.: Research on Automatic Takeoff and Landing Control Technology for Unmanned Helicopter. Nanjing University of Aeronautics and Astronautics, Nanjing (2012). (in Chinese)
4. Wu, P., Shi, Z., Yan, P.: Research on the unmanned helicopter carrier landing automatically. Ship Sci. Technol. 41(05), 148–152 (2019). (in Chinese)
5. Kiefer, J., Ward, M., Costello, M.: Rotorcraft hard landing mitigation using robotic landing gear. J. Dyn. Syst. Meas. Contr. 138(3), 2302–2308 (2016)