Ordinary Differential Equations

Periodic solutions under steadily acting perturbations

V. V. Amel'kin^a, I. V. Gaishun^a, N. N. Ladis<sup>b

a</sup> Institute of Mathematics, Academy of Sciences Byelorussian SSR
^b V. I. Lenin Belorusskii State University

UDC: 517.938

Received: 06.12.1973

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