1. Introduction to the Theory of Stability of Motion;Merkin,1976
2. On stability of autonomous systems with internal resonance;Gol'tser;PMM,1975
3. Dynamical Systems;Birkhoff,1966
4. Local Method for the Nonlinear Analysis of Differential Equations;Briuno,1979
5. Stable and random motions in dynamical systems;Moser,1973