@article{02174292,
title = {Concave schlicht functions with bounded opening angle at infinity.},
journal = {Lobachevskii Journal of Mathematics},
volume = {17},
year = {2005},
pages = {3-10},
zbl = {1071.30005},
language = {en},
url = {http://dml.mathdoc.fr/item/02174292}
}
Avkhadiev, F.G.; Wirths, K.-J. Concave schlicht functions with bounded opening angle at infinity.. Lobachevskii Journal of Mathematics, Tome 17 (2005) pp. 3-10. http://gdmltest.u-ga.fr/item/02174292/