%0 Journal Article %A Taylor, W.E. jr. %T Oscillation properties of fourth order difference equations %J Portugaliae mathematica %D 1988 %P 105-114 %V 45 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1988__45_1_115614/ %G en %F PORMA_1988__45_1_115614