@article{GDZPPN002434350,
title = {On the Angular Derivative of Analytic Functions.},
journal = {Mathematische Zeitschrift},
volume = {194},
year = {1987},
pages = {591-601},
zbl = {0616.30033},
url = {http://dml.mathdoc.fr/item/GDZPPN002434350}
}
Gnuschke-Hauschild, D. On the Angular Derivative of Analytic Functions.. Mathematische Zeitschrift, Tome 194 (1987) pp. 591-601. http://gdmltest.u-ga.fr/item/GDZPPN002434350/