1. Helicopter Flight Dynamics: The Theory and Application of Flying Qualities and Simulation Modeling;Padfield,1999
2. Towards better understanding of helicopter stability derivaties;Hansen;Journal of American Helicopter Society,1984
3. J.A. Molusis, Analytical Study to Define a Helicopter Derivative Extraction Method NASA-CR-132371, 1973.
4. AGARD, Rotorcraft System Identification, AGARD AR 280, LS 178, 1991.
5. Helicopter Performance, Stability, and Control;Prouty,1986