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@article{MAN_1986__276_164214, author = {Ch. Pommerenke}, title = {On the {Boundary} {Derivative} for {Univalent} {Functions.}}, journal = {Mathematische Annalen}, pages = {499--504}, publisher = {mathdoc}, volume = {276}, year = {1986}, zbl = {0596.30027}, url = {http://geodesic.mathdoc.fr/item/MAN_1986__276_164214/} }
Ch. Pommerenke. On the Boundary Derivative for Univalent Functions.. Mathematische Annalen, Tome 276 (1986), pp. 499-504. http://geodesic.mathdoc.fr/item/MAN_1986__276_164214/