Gladilina, R.I. 2013. On modification of the theorems of direct Lyapunov method for impulsive systems. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics. 1061 (May 2013), 17-29. DOI:https://doi.org/10.26565/2221-5646-2013-1061-02.