TY  - JOUR
AU  - Neal Brand
TI  - Necessary Conditions for the Existence of Branched Coverings.
JO  - Inventiones mathematicae
PY  - 1979
SP  - 1
EP  - 10
VL  - 54
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1979__54_142668/
ID  - IM_1979__54_142668
ER  -