%0 Journal Article
%A Kwong, Man Kam
%A Wong, James S.W.
%T An optimal existence theorem for positive solutions of a four-point boundary value problem
%J Electronic Journal of Differential Equations
%D 2009
%V 2009
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a77/
%G en
%F EJDE_2009__2009__a77