TY  - JOUR
AU  - N. S. Romanovskii
TI  - Free subgroups of finitely-presented groups
JO  - Algebra i logika
PY  - 1977
SP  - 88
EP  - 97
VL  - 16
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1977_16_1_a6/
LA  - ru
ID  - AL_1977_16_1_a6
ER  -