1. M. While and G. Hepper,J. Vibration and Acoustics,118, 606 (1996).
2. L. Meirovitch, “Dynamics and Control of Structures”, John Wiley and Sons, NY, 1992.
3. W. B. Gevarter,AIAA J.,8(4), 666 (1970).
4. B. Wie and A. E. Bryson, “Proceedings of the Third VPI&SU/AIAA Symposium”, pp.153–174, Blacksburg, VA, 1981.
5. B. C. Kuo, “Automatic Control Systems”, 7th ed., Prentice-Hall, 1997.