Literature cited
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V. P. Rubanik, “The application of the asymptotic method of N. M. Krylov and N. N. Bogolyubov to quasilinear differential-difference equations,” Ukrainsk. Matem. Zh.,11, No. 3 (1959).
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S. N. Shimanov, “The critical case of a pair of purely imaginary roots for systems with aftereffect,” Sibirsk. Matem. Zh.,2, No. 3 (1961).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 20, No. 6, pp. 814–825, November–December, 1968.
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Shimanov, S.N. Asymptotic determination of single-frequency vibrations in a quasi-linear autonomous system with time-lag. Ukr Math J 20, 703–712 (1968). https://doi.org/10.1007/BF01085239
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DOI: https://doi.org/10.1007/BF01085239