1. Ahmad S., Stamova I.M.: Global exponential stability for impulsive cellular neural networks with time–varying delays. Nonlinear Anal. 69, 786–795 (2008)
2. D. D. Bainov, P. S. Simeonov, Systems with Impulse Effect. Elles Horwood Limited, Chichester, 1989.
3. C. T. H. Baker, A. Tang, Generalized Halanay inequalities for Volterra functional differential equations and discretized versions. In: “Volterra Equations and Applications” (C. Corduneanu & I. W. Sandberg Eds), 39–55, Stability Control Theory Methods Appl. 10, Gordon and Breach, Amsterdam, 2000.
4. Dix J.G., Philos C.G., Purnas I.K.: An asymptotic property of solutions to linear nonautonomous delay differential equations. Electron. J. Differential Equations 2005, 1–9 (2005)
5. Fu X., Li X.: Global exponential stability and global attractivity of impulsive Hopfield neural networks with time delays. J. Comput. Appl. Math. 231, 187–199 (2009)