%0 Journal Article %A Zdzisław Frydrych %T On certain oscillatory properties for solutions of an equation with a biharmonic leading part %J Annales Polonici Mathematici %D 1974 %P 225-228 %V 30 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-30-3-225-228/ %R 10.4064/ap-30-3-225-228 %G en %F 10_4064_ap_30_3_225_228