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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 26, No. 1, pp. 37–50, January–February, 1974.
The author is deeply grateful to Yu. A. Mitropol'skii and participants at his seminar for attention and discussion of the results of this paper.
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Sabirov, T. The method of normalizing transformations in branching theory for periodic solutions of nonlinear singularly perturbed systems of differential equations. Ukr Math J 26, 27–38 (1974). https://doi.org/10.1007/BF01086044
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DOI: https://doi.org/10.1007/BF01086044