1. L. E. El’sgol’ts and S. B. Norkin, Introduction to the Theory and Application of Differential Equations with Deviating Argument (Academic, New York, 1973).
2. J. K. Hale, Theory of Functional Differential Equations (Springer, New York, 1977).
3. D. G. Korenevskii, Stability of Dynamical Systems under Random Perturbations of Parameters. Algebraic Criteria (Naukova Dumka, Kiev, 1989) [in Russian].
4. N. V. Azbelev, Selected Works (Inst. Komp’yut. Issled., Moscow, 2012) [in Russian].
5. Yu. F. Dolgii, Stability of Periodic Differential-Difference Equations (Ural Univ., Yekaterinburg, 1996) [in Russian].