Literature cited
L. E. El'cgol'ts and S. B. Norkin, Introduction to the Theory of Differential Equations with a Deviated argument [in Russian], Nauka, Moscow (1971).
D. Ya. Khusainov and A. N. Sharkovskii, “On the stability of solutions of differential equations with retarded argument,” in: Functional and Difference-Differential Equations [in Russian], Mathematics Institute, Academy of Sciences of the Ukrainian SSR, Kiev (1974), pp. 141–147.
E. A. Barbashin, Lyapunov Functions [in Russian], Nauka, Moscow (1970).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 35, No. 2, pp. 261–264, March–April, 1981.
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Khusainov, D.Y., Yun'kova, E.A. Estimation of magnitude of retardation in linear differential systems with deviated argument. Ukr Math J 35, 227–230 (1983). https://doi.org/10.1007/BF01088943
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DOI: https://doi.org/10.1007/BF01088943