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@article{IM_1979__54_142668, author = {Neal Brand}, title = {Necessary {Conditions} for the {Existence} of {Branched} {Coverings.}}, journal = {Inventiones mathematicae}, pages = {1--10}, publisher = {mathdoc}, volume = {54}, year = {1979}, zbl = {0415.57024}, url = {http://geodesic.mathdoc.fr/item/IM_1979__54_142668/} }
Neal Brand. Necessary Conditions for the Existence of Branched Coverings.. Inventiones mathematicae, Tome 54 (1979), pp. 1-10. http://geodesic.mathdoc.fr/item/IM_1979__54_142668/