Lyapunov-Razumikhin method for asymptotic stability of sets for impulsive functional differential equations. Stamova, Ivanka M.; Stamov, Gani T. — 2008 Electronic Journal of Differential Equations (EJDE) [electronic only]
Global stability of sets for impulsive differential-difference equations by Lyapunov's direct method Drumi D. Bainov; Ivanka M. Stamova — 1999 Acta Mathematica et Informatica Universitatis Ostraviensis