1. Faddeev, D. K., Faddeeva, V. N. Computational Methods of Linear Algebra (Fizmatgiz, Moscow–Leningrad, 1963) [in Russian].
2. Daletskii, Yu. L., Krein, M. G. Stability of Solutions of Differential Equations in Banach Space (Nauka, Moscow, 1970) [in Russian].
3. Bylov, B. F., Vinograd, R. E., Grobman, D. M., Nemytskii, V. V. Theory of Lyapunov Exponents and its Application to Problems of Stability (Nauka, Moscow, 1966) [in Russian].
4. Lozinskii, S. M. “Error Estimate for Numerical Integration of Ordinary Differential Equations. I”, Izv. Vyssh. Uchebn. Zaved.Mat., No. 5, 52–90 (1958) [in Russian]
5. Beckenbach E.F., Bellman R. Inequalities (Springer, Berlin–Gö ttingen–Heidelberg, 1961; Mir, Moscow, 1965).