@article{GDZPPN002333686, title = {Hyperbolicity and branched coverings.}, journal = {Mathematische Annalen}, volume = {287}, year = {1990}, pages = {537-548}, zbl = {0847.32029}, url = {http://dml.mathdoc.fr/item/GDZPPN002333686} }
Schumacher, Georg; Takegoshi, Kensho. Hyperbolicity and branched coverings.. Mathematische Annalen, Tome 287 (1990) pp. 537-548. http://gdmltest.u-ga.fr/item/GDZPPN002333686/