%0 Journal Article %A Grace, Said R. %T Oscillatory behaviour of certain difference equations %J Mathematica slovaca %D 2000 %P 345-355 %V 50 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_2000__50_3_a7/ %G en %F MASLO_2000__50_3_a7