1. A survey of the theory of the boundedness, stability and asymptotic behavior of solutions of linear and non-linear differential and difference equations;Bellman,1949
2. Stability Theory of Differential Equations;Bellman,1953
3. Asymptotic Behavior and Stability Problems in Ordinary Differential Equations;Cesari,1963
4. Stability and Asymptotic Behavior of Differential Equations;Coppel,1965
5. Theory of Ordinary Differential Equations;Coddington,1955