TY  - JOUR
AU  - R. I. Grigorchuk
AU  - P. F. Kurchanov
TI  - Classification of epimorphisms of fundamental groups of surfaces onto free groups
JO  - Matematičeskie zametki
PY  - 1990
SP  - 26
EP  - 35
VL  - 48
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1990_48_2_a3/
LA  - ru
ID  - MZM_1990_48_2_a3
ER  -