1. A. M. Lyapunov, The General Problem of the Stability of Motion (GITTL, Moscow, 1950) [in Russian].
2. N. N. Krasovskii, Some Problems in the Theory of Motion Stability (GIFML, Moscow, 1959) [in Russian].
3. W. A. Coppel, Stability and Asymptotic Behavior of Differential Equations (D.C. Heart, Lexington, 1965).
4. Yu. L. Daletskii and M. G. Krein, Stability of Solutions of Differential Equations in Banach Space (Nauka, Moscow, 1970) [in Russian].
5. I. V. Boikov, Stability of Solutions of Differential Equations (Penza State Univ., Penza, 2008) [in Russian].