%0 Journal Article %A PalumbĂ­ny, Oleg %T On oscillatory solutions of fourth order ordinary differential equations %J Czechoslovak Mathematical Journal %D 1999 %P 779-790 %V 49 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_1999__49_4_a8/ %G en %F CMJ_1999__49_4_a8