An upper bound for the number of periodic solutions of a perturbed system (Q773227)

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scientific article; zbMATH DE number 3157322
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An upper bound for the number of periodic solutions of a perturbed system
scientific article; zbMATH DE number 3157322

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    An upper bound for the number of periodic solutions of a perturbed system (English)
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    1960
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    ordinary differential equations
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