%0 Journal Article
%A Karakostas,  G.L.
%A Tsamatos,  P.Ch.
%T Positive solutions and nonlinear eigenvalue problems for retarded second order differential equations
%J Electronic journal of differential equations
%D 2002
%V 2002
%U http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a245/
%G en
%F EJDE_2002__2002__a245