1. Random Vibration of Mechanical and Structural Systems;Soong,1993
2. Time-Delay Systems Analysis, Optimization and Applications;Malek-Zavarei,1987
3. Teoria Calitativã a Systemelor cu Impulsuri;Halanay,1968
4. Differential Equations, Stability, Oscillations, Time Lags;Halanay,1966
5. Automatic Control Systems;Kuo,1987