1. “US Army looking at three configuration concepts for large cargo rotorcraft”. Flight International, October 9, 2007
2. P. Adigbli, C. Grand, J. B. Mouret and S. Doncieux, “Nonlinear Attitude and Position Control of a Micro Quadrotor using Sliding Mode and Backstepping Techniques”, World Academy of Science, Engineering and Technology 26 2007