TY  - JOUR
AU  - Sheng Chen
AU  - Hong You
TI  - Subrings in imaginary quadratic fields which
 are not universal for $GE_2$
JO  - Acta Arithmetica
PY  - 2003
SP  - 299
EP  - 305
VL  - 107
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/aa107-3-6/
DO  - 10.4064/aa107-3-6
LA  - en
ID  - 10_4064_aa107_3_6
ER  -