@article{GDZPPN00240818X,
title = {The Boundary Behaviour of Derivatives of Univalent Functions.},
journal = {Mathematische Zeitschrift},
volume = {121},
year = {1971},
pages = {115-120},
zbl = {0196.09201},
url = {http://dml.mathdoc.fr/item/GDZPPN00240818X}
}
Lohwater, A.J. The Boundary Behaviour of Derivatives of Univalent Functions.. Mathematische Zeitschrift, Tome 121 (1971) pp. 115-120. http://gdmltest.u-ga.fr/item/GDZPPN00240818X/