A. Drouin, S. Simoes-Cunha, and A. C. Brandao-Ramos, “Differential Flatness and Control of Nonlinear Systems,” Proceedings of the 30th Chinese Control Conference, 22-24 July 2011, Yantai, pp. 643-648.
 M. Xin, Y. J. Xu and R. Hopkins, “Trajectory Control of Miniature Helicopters Using a Unified Nonlinear Optimal Control Technique,” Journal of Dynamic Systems, Measurement and Control, Vol. 133, No. 6, 2011, 14 p.
 K. T. Oner, E. Cetinsoy, M. Unel, et al., “Dynamic Model and Control of a New Quadrotor Unmanned Aerial vehicle with Tilt-Wing Mechanism,” World Academy of Science, Engineering and Technology, 2008.
 Z. Fang and W. N. Gao, “Adaptive Integral Backstepping Control of a Micro-Quadrotor,” The 2nd International Conference on Intelligent Control and Information Processing, Harbin, 25-28 July 2011, pp. 910-915.
 K. T. Oner, E. Cetinsoy, E. Sirimoglu, et al., “Mathematical Modeling and Vertical Flight Control of a Tilt-Wing UAV,” Turkish Journal of Electrical Engineering & Computer Sciences, Vol. 20, No. 1, 2012, p. 149.
 A. Das, K. Subbarao and F. Lewis, “Dynamic Inversion with Zero-Dynamics Stabilisation for Quadrotor Control,” IET Control Theory Applications, Vol. 3, No. 3, 2009, pp. 303-314.