Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS2_1967__21_166011, author = {B.G. Eke}, title = {On the {Angular} {Derivative} of {Regular} {Functions.}}, journal = {Mathematica Scandinavica}, pages = {122--127}, publisher = {mathdoc}, volume = {21}, year = {1967}, zbl = {0167.06301}, url = {http://geodesic.mathdoc.fr/item/MS2_1967__21_166011/} }
B.G. Eke. On the Angular Derivative of Regular Functions.. Mathematica Scandinavica, Tome 21 (1967), pp. 122-127. http://geodesic.mathdoc.fr/item/MS2_1967__21_166011/