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Planar nonautonomous polynomial equations IV. Nonholomorphic case

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We give a few sufficient conditions for the existence of periodic solutions of the equation [formula] where n > r and aj 's, ck's are complex valued. We prove the existence of one up to two periodic solutions.
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357--375
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Bibliogr. 24 poz.
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Bibliografia
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Bibliografia
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bwmeta1.element.baztech-article-AGHT-0007-0026
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