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@article{DCG_1988__3_1-2_131055, author = {B. Mohar}, title = {Branched {Coverings.}}, journal = {Discrete & computational geometry}, pages = {339--348}, publisher = {mathdoc}, volume = {3}, number = {1-2}, year = {1988}, zbl = {0644.57001}, url = {http://geodesic.mathdoc.fr/item/DCG_1988__3_1-2_131055/} }
B. Mohar. Branched Coverings.. Discrete & computational geometry, Tome 3 (1988) no. 1-2, pp. 339-348. http://geodesic.mathdoc.fr/item/DCG_1988__3_1-2_131055/