1. Akhmet M (2010) Principles of discontinuous dynamical systems. Springer, New York
2. Akhmetov MU (1982) On periodic solutions of certain systems of differential equations. Vestn Kiev Univer Mat i Mekh (Russian) 24:3–7
3. Akhmetov MU (1991) Periodic solutions of non-autonomous systems of differential equations with impulse action in the critical case. (Russian) Izv Akad Nauk Kazakh SSR Seria Fiz-Mat 3:62–65
4. Akhmetov MU, Perestyuk NA (1984) On the almost periodic solutions of a class of systems with impulse effect. (Russian) Ukr Mat Zh 36:486–490
5. Akhmetov MU, Perestyuk NA (1992) Periodic and almost-periodic solutions of strongly nonlinear impulse systems. J Appl Math Mech 56:829–837