@article{GDZPPN002318814,
title = {On the Derivative of the Riemann Mapping Function Near a Boundary Point and the Visser-Ostrowski Problem.},
journal = {Mathematische Annalen},
volume = {250},
year = {1980},
pages = {125-138},
zbl = {0411.30001},
url = {http://dml.mathdoc.fr/item/GDZPPN002318814}
}
Rodin, Burton; Warschawski, S.E. On the Derivative of the Riemann Mapping Function Near a Boundary Point and the Visser-Ostrowski Problem.. Mathematische Annalen, Tome 250 (1980) pp. 125-138. http://gdmltest.u-ga.fr/item/GDZPPN002318814/