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On the coexistence of periodic solutions. (English) Zbl 0208.10903


MSC:

34C25 Periodic solutions to ordinary differential equations
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References:

[1] Borůvka, O, Lineare differentialtransformationen 2. ordnung, (1967), VEB Berlin · Zbl 0153.11201
[2] Magnus, W; Winkler, S, Hill’s equation, (1966), Wiley New York · Zbl 0158.09604
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