TY  - JOUR
AU  - Hartley, B.
AU  - Pickel, P. F.
TI  - Free Subgroups in the Unit Groups of Integral Group Rings
JO  - Canadian journal of mathematics
PY  - 1980
SP  - 1342
EP  - 1352
VL  - 32
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-104-3/
DO  - 10.4153/CJM-1980-104-3
ID  - 10_4153_CJM_1980_104_3
ER  -