@article{GDZPPN002257394, title = {Stetigkeit und Differentialquotient}, journal = {Mathematische Annalen}, volume = {51}, year = {1899}, pages = {58-69}, zbl = {30.0265.02}, url = {http://dml.mathdoc.fr/item/GDZPPN002257394} }
Steinitz, Ernst. Stetigkeit und Differentialquotient. Mathematische Annalen, Tome 51 (1899) pp. 58-69. http://gdmltest.u-ga.fr/item/GDZPPN002257394/