1. 2Gibson, J. E., Nonlinear Automatic Control, McGraw-Hill, New York, 1963, pp.380-385.
2. 3Gelb, A., and Vander Velde, W. E., Multiple-Input Describing Functions and Nonlinear Design, McGraw-Hill, New York, 1968, pp.163-185.
3. Attitude stabilization of flexible spacecraft during stationkeeping maneuvers