%0 Journal Article
%A C.N. Delzell
%T A continuous, constructive solution to Hilbert's 17th problem.
%J Inventiones mathematicae
%D 1984
%P 365-384
%V 76
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1984__76_143128/
%F IM_1984__76_143128