TY  - JOUR
AU  - Cordes, Craig M.
TI  - Abstract Witt Rings When Certain Binary Forms Represent Exactly Four Elements
JO  - Canadian journal of mathematics
PY  - 1993
SP  - 1184
EP  - 1199
VL  - 45
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1993-066-7/
DO  - 10.4153/CJM-1993-066-7
ID  - 10_4153_CJM_1993_066_7
ER  -