%0 Journal Article
%A Sheng Chen
%A Hong You
%T Subrings in imaginary quadratic fields which
 are not universal for $GE_2$
%J Acta Arithmetica
%D 2003
%P 299-305
%V 107
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/aa107-3-6/
%R 10.4064/aa107-3-6
%G en
%F 10_4064_aa107_3_6