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[1] Andres J.: Boundedness of solutions of the third order differential equation with oscillatory restoring and forcing terms. Czech. Math. Journal, V.36 111, No.1, Praha 1986. MR 0822859 | Zbl 0608.34039
[2] Vlček V.: On the boundedness of solutions of a certain fourth-order nonlinear differential equation. (to appear). MR 1039895 | Zbl 0719.34060
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