@article{01562986,
title = {Covering properties of meromorphic functions, negative curvature and spherical geometry.},
journal = {Annals of Mathematics. Second Series},
volume = {151},
year = {2000},
pages = {551-592},
doi = {10.2307/2661392},
zbl = {0970.30016},
language = {en},
url = {http://dml.mathdoc.fr/item/01562986}
}
Bonk, M.; Eremenko, A. Covering properties of meromorphic functions, negative curvature and spherical geometry.. Annals of Mathematics. Second Series, Tome 151 (2000) pp. 551-592. doi : 10.2307/2661392. http://gdmltest.u-ga.fr/item/01562986/