TY  - JOUR
AU  - Ree, Rimhak
TI  - On Certain Pairs of Matrices which do not Generate a Free Group
JO  - Canadian mathematical bulletin
PY  - 1961
SP  - 49
EP  - 52
VL  - 4
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-008-3/
DO  - 10.4153/CMB-1961-008-3
ID  - 10_4153_CMB_1961_008_3
ER  -