Literature cited
L. E. Él'sgol'ts, Qualitative Methods in Mathematical Analysis [in Russian], Gostekhizdat, Moscow (1955).
A. P. Proskuryakov, “Oscillations of quasilinear nonautonomous systems with one degree of freedom near resonance,“ PMM,23, No. 5 (1959).
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Translated from Ukralnskii Maternaticheska Zhurnal, Vol. 22, No. 2, pp. 242–247, March–April, 1970.
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Misak, V.V. Periodic solutions of nonautonomous quasilinear systems with delay in the case of multiple roots of the amplitude equations. Ukr Math J 22, 210–213 (1970). https://doi.org/10.1007/BF01125611
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DOI: https://doi.org/10.1007/BF01125611