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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.: A note to a certain nonlinear differential equation of the third order. ACTA UP Olom., F.R.N. Math. XXVII, Vol.91, 1988. MR 1039894 | Zbl 0725.34034
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