TY  - JOUR
AU  - A. N. Protopopov
TI  - Topological classification of branched coverings of the two-dimensional sphere
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 1988
SP  - 135
EP  - 156
VL  - 167
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_1988_167_a9/
LA  - ru
ID  - ZNSL_1988_167_a9
ER  -