TY  - JOUR
AU  - Jan Krempa
TI  - On free subgroups of units in quaternion algebras II
JO  - Colloquium Mathematicum
PY  - 2003
SP  - 29
EP  - 32
VL  - 97
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm97-1-4/
DO  - 10.4064/cm97-1-4
LA  - en
ID  - 10_4064_cm97_1_4
ER  -