%0 Journal Article
%A Jiang,  Daqing
%A Wei,  Junjie
%A Zhang,  Bo
%T Positive periodic solutions of functional differential equations and population models
%J Electronic journal of differential equations
%D 2002
%V 2002
%U http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a216/
%G en
%F EJDE_2002__2002__a216