1. Ordinary Differential Equations;Hale,1969
2. Ordinary Differential Equations with Applications;Chicone,1999
3. Dichotomies in Stability Theory;Coppel,1978
4. A note on the asymptotic stability of periodic solutions of autonomous differential equations;De Kleine;SIAM Rev.,1984
5. Differential Equations: Geometric Theory;Lefschetz,1977