Author: Andres, Ján

Andres, Ján: Periodic derivative of solutions to nonlinear differential equations. (English). Czechoslovak Mathematical Journal, vol. 40 (1990), issue 3, pp. 353-360
Andres, Ján: Boundedness of solutions of the third order differential equation with oscillatory restoring and forcing terms. (English). Czechoslovak Mathematical Journal, vol. 36 (1986), issue 1, pp. 1-6

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