%0 Journal Article
%A Raffoul,  Youssef N.
%T Positive periodic solutions of nonlinear functional difference equations
%J Electronic journal of differential equations
%D 2002
%V 2002
%U http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a73/
%G en
%F EJDE_2002__2002__a73