@article{JDM_1908__17_145098,
     author = {Georg Landsberg},
     title = {\"Uber {Differentiierbarkeit} stetiger {Funktionen.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {46--51},
     publisher = {mathdoc},
     volume = {17},
     year = {1908},
     zbl = {39.0454.01},
     url = {http://geodesic.mathdoc.fr/item/JDM_1908__17_145098/}
}