Impulsive Differential Equations with a Small Parameter - Drumi D. Bainov; Valéry Covachev (World Scientific, 1994)

Difference approximations for impulsive differential equations. - Valéry Covachev; Haydar Akça; Ali Fuat Yeniçerioglu (Appl. Math. Comput., 2001)

Exponential Stability of Neural Networks with Time-Varying Delays and Impulses. - Haydar Akça; Valéry Covachev; Kumud Singh Altmayer (ISNN (4), 2009)

Existence of Periodic Solutions for the Discrete-Time Counterpart of a Complex-Valued Hopfield Neural Network with Time-Varying Delays and Impulses. - Valéry Covachev; Zlatinka Covacheva (IJCNN, 2018)