1. Demidovich B.P. Lectures on the mathematical theory of stability. Moscow, Science, 1967, 472 p.
2. Lyapunov A.M. The general problem of motion stability. M.–L.: Gostekhizdat, (Classics of Natural Science), 1950. - 471 p.
3. Almost Periodic Solutions of First-Order Ordinary Differential Equations
4. Kadry, S., Alferov, G., Ivanov, G., Sharlay, A. Derived Numbers of One Variable Monotonic Functions (2019) IJPAM, N41, 2019. pp.637–648.
5. Kadry, S., Alferov, G., Ivanov, G., Sharlay, A. Derived Numbers of One Variable Convex Functions (2019) IJPAM, N41, 2019. pp.649–662.