1. Some new results in linear time-varying systems;Wu;IEEE Trans Automat Control,1975
2. Estimation and Control in Time-Varying Linear Systems;Morozov,1988
3. The application of methods of the theory of reducibility to some problems in the dynamics of gyroscopic systems;Kalenova;Izv Akad Nauk SSSR MTT,1987
4. The Stability of Motion. Papers on Analytical Mechanics;Chetayev,1962
5. Gyroscopic Systems;Merkin,1974