1. “Stability Theory.”;Hahn,1967
2. “Linear Differential Equations and Function Spaces.”;Massera,1966
3. “Stability of Motion.”;Krasovski,1963
4. “Theory and Application of Lyapunov's Direct Method.”;Hahn,1963
5. “Asymptotic Behavior and Stability Problems in Ordinary Differential Equations.”;Cesari,1963