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@article{MAN_1978__238_163191, author = {Peter Lappan}, title = {On the {Normality} of {Derivatives} of {Functions.}}, journal = {Mathematische Annalen}, pages = {141--146}, publisher = {mathdoc}, volume = {238}, year = {1978}, zbl = {0372.30023}, url = {http://geodesic.mathdoc.fr/item/MAN_1978__238_163191/} }
Peter Lappan. On the Normality of Derivatives of Functions.. Mathematische Annalen, Tome 238 (1978), pp. 141-146. http://geodesic.mathdoc.fr/item/MAN_1978__238_163191/