CONTENTSIntroduction ??1. General theory ??2. Linear differential equations with a perturbed argument ??3. Linear equations with constant coefficients and constant perturbations and related equations ??4. Stability theory ??5. Boundary value and variational problems ??6. Periodic solutions ??7. Approximation methods for the solution of equations with a perturbed argument ??8. Some other papersReferences
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Zverkin et al. (1962) studied this question.