1. Qualitative analysis of dynamic equations on time scales;Abbas;Electron. J. Differ. Equ.,2018
2. E. A. Barbašin, Introduction to the theory of stability, in: T. Lukes (Ed.), Groningen, 1970. Translation of Vvedenie v teoriyu ustoichivosti, Wolters-Noordhoff Publishing
3. E.A. Barbašin, Vvedenie v teoriyu ustoichivosti [Introduction to the Theory of Stability], 1967. Izdat. “Nauka”, Moscow.
4. Optimal control of systems with variable structure;Buyakas;Autom. Remote Control,1966
5. Asymptotic expansions and analytic dynamic equations;Bohner;ZAMM,2006