%0 Journal Article %A Zeng, Zhijun %T Existence of positive periodic solutions for a class of nonautonomous difference equations %J Electronic Journal of Differential Equations %D 2006 %V 2006 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a188/ %G en %F EJDE_2006__2006__a188