TY  - JOUR
AU  - G. Rosenberger
TI  - On free subgroups of generalized triangle groups
JO  - Algebra i logika
PY  - 1989
SP  - 227
EP  - 240
VL  - 28
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1989_28_2_a6/
LA  - en
ID  - AL_1989_28_2_a6
ER  -