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References:
[1] Aпdres J., Voráček J.: Periodic solutions to a non-linear parametric differential equatioп of the third order. Accad. Naz. Lincei, Cl.fis.mat.nat., S.VIII, vol. LXXVII, fasc.3-4, 81-86.
[2] Hardy G.H., Littlewood J.E., Polya G.: Inequalities. Cambridge Univ.Press, Cambridge, 1952. MR 0046395 | Zbl 0047.05302
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