@article{1138847176, author = {Oikawa, K\'otaro}, title = {On angular derivatives of univalent functions}, journal = {Kodai Math. Sem. Rep.}, volume = {27}, number = {1-2}, year = {1976}, pages = { 193-210}, language = {en}, url = {http://dml.mathdoc.fr/item/1138847176} }
Oikawa, Kótaro. On angular derivatives of univalent functions. Kodai Math. Sem. Rep., Tome 27 (1976) no. 1-2, pp. 193-210. http://gdmltest.u-ga.fr/item/1138847176/