1. The General Problem of Stability of Motion;Lyapunov,1982
2. Nonlinear Systems;Khalil,1996
3. Nonlinear Systems: Analysis, Stability, and Control;Sastry,1999
4. Generalized Lyapunov and invariant set theorems for nonlinear dynamical systems;Chellaboina;Systems Control Lett.,1999
5. Switching in systems and control;liberzon,2003