1. Zubov, V.I.: Lyapunov’s Methods and Their Application. Leningrad State University Publishing, Leningrad (1957).(in Russian)
2. Demidovich, B.P.: Lectures on the Mathematical Theory of Stability Science. Moscow (1967).(in Russian)
3. Gantmakher, F.R.: Matrix Theory. Fizmatlit, Moscow (2010).(in Russian)
4. Lyapunov, A.M.: The general problem of motion stability. (Classics of Natural Science). Gostekhizdat, Moscow-Leningrad (1950) (in Russian)
5. Arnold, V.I.: Ordinary Differential Equations. Science, Moscow (1975).(in Russian)