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N. N. Bogolyubov and Yu. A. Mitropol'skii, Asymptotic Methods in The Theory of Nonlinear Oscillations [in Russian], Fizmatgiz, Moscow (1963).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 26, No. 2, pp. 265–268, March–April, 1974.
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Senik, P.M., Senik, S.G. Construction of approximate solutions of two linear differential equations with periodic coefficients. Ukr Math J 26, 222–225 (1974). https://doi.org/10.1007/BF01085726
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DOI: https://doi.org/10.1007/BF01085726