Ordinary Differential Equations

Center conditions and cyclicity of certain cubic vector fields

Ч. Доличанин^a, V. G. Romanovsky^b, M. Stefanovich<sup>b

a</sup> University of Prishtina, Yugoslavia
^b Center for Applied Mathematics and Theoretical Physics, University of Maribor, Slovenia

UDC: 517.925

Received: 24.12.1997

 English version: Differential Equations, 1998, 34:12, 1591–1599

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