Ordinary Differential Equations

The periodic solutions of second order systems

V. V. Amel'kin^a, I. V. Gaishun<sup>b

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

UDC: 517.925.12

Received: 22.11.1973

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