Ordinary Differential Equations

Conditions for two centers for a quadratic differential system

È. F. Kirnitskaya^a, K. S. Sibirskii<sup>b

a</sup> Mathematics Institute, Computer Center, Academy of Sciences of the Moldavian SSR
^b Chishinau Technical Institute named after S. Lazo

UDC: 517.925.1

Received: 24.03.1977

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