1. G. Bir, K. Stol, Operating modes of a teetered-rotor wind turbine, in: 17th International Modal Analysis Conference (IMAC XVII) Kissimmee, Florida, 1999.
2. Modal response of 3-bladed wind turbines;Malcolm;Journal of Solar Energy Engineering, Transactions of the ASME,2002
3. Floquet modal analysis of a teetered-rotor wind turbine;Stol;Journal of Solar Energy Engineering-Transactions of the ASME,2002
4. Some analysis methods for rotating systems with periodic coefficients;Dugundji;AIAA Journal,1983
5. C. Fuehne, Application of generalized Floquet Theory to ground resonance data, in: 56th Annual National Forum of the American Helicopter Society Virginia Beach, VA, 2000.