1. Stability analysis of constant linear systems by Lyapunov's second method;Barnett;Electron. Letters,1966
2. Introduction to Matrix Analysis;Bellman,1960
3. Theory and Application of Lyapunov's Direct Method;Hahn,1963
4. Methods of Mathematical Physics;Jeffreys,1956
5. Control system analysis and design via the second method of Lyapunov;Kalman;Trans. Am. Soc. Mech. Engrs.,1960