@article{MZ_1936__40_168599,
     author = {G. Aumann},
     title = {Zwei {S\"atze} \"uber {Differential-} und {Differenzquotient} von analytischen {Funktionen}},
     journal = {Mathematische Zeitschrift},
     pages = {202--204},
     year = {1936},
     volume = {40},
     zbl = {61.0305.03},
     url = {http://geodesic.mathdoc.fr/item/MZ_1936__40_168599/}
}