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## Valery Covachev

#### Articles in Scholarly Journals [Incomplete List]

- Almost periodic solutions of neutral impulsive systems with periodic time-dependent perturbed delays

Central European Journal of Mathematics, vol. 1, no. 3, pp. 292–314, 2003 - Impulsive functional-differential equations with nonlocal
conditions

International Journal of Mathematics and Mathematical Sciences, vol. 29, no. 5, pp. 251–256, 2002 - Difference approximations for impulsive differential equations

Applied Mathematics and Computation, vol. 121, no. 2-3, pp. 383–390, 2001 - Journal of Physics A: Mathematical and General, vol. 27, no. 16, pp. 5551–5563, 1994
- Stability under Persistent Disturbances of Impulsive Differential-Difference Equations of Neutral Type

Journal of Mathematical Analysis and Applications, vol. 187, no. 3, pp. 790–808, 1994 - Weighted Decay Estimate for the Wave Equation

Proceedings of the American Mathematical Society, vol. 112, no. 2, p. 393, 1991 - Invariant Tori for the Billiard Ball Map

Transactions of the American Mathematical Society, vol. 317, no. 1, p. 45, 1990