%0 Journal Article %A Rovder, Jozef %T Oscillatory properties of the fourth order linear differential equation %J Mathematica slovaca %D 1983 %P 371-379 %V 33 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1983__33_4_a6/ %G en %F MASLO_1983__33_4_a6