@article{GDZPPN00232914X,
title = {On the Boundary Derivative for Univalent Functions.},
journal = {Mathematische Annalen},
volume = {275},
year = {1986},
pages = {499-504},
zbl = {0596.30027},
url = {http://dml.mathdoc.fr/item/GDZPPN00232914X}
}
Pommerenke, Ch. On the Boundary Derivative for Univalent Functions.. Mathematische Annalen, Tome 275 (1986) pp. 499-504. http://gdmltest.u-ga.fr/item/GDZPPN00232914X/