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On the stability of the center for time-periodic perturbations. (English. Russian original) Zbl 0135.31001

Trans. Mosc. Math. Soc. 12, 1-56 (1963); translation from Tr. Mosk. Mat. O.-va 12, 3-52 (1963).

MSC:

34Dxx Stability theory for ordinary differential equations
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