%0 Journal Article
%A Fine, Benjamin
%T Sum of Squares Rings
%J Canadian journal of mathematics
%D 1977
%P 155-160
%V 29
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-014-3/
%R 10.4153/CJM-1977-014-3
%F 10_4153_CJM_1977_014_3