@article{MZ_1940__46_168899,
     author = {C., Carath\'eodory},
     title = {\"Uber die {Differentiation} von {Ma{\ss}funktionen}},
     journal = {Mathematische Zeitschrift},
     pages = {181--189},
     publisher = {mathdoc},
     volume = {46},
     year = {1940},
     zbl = {66.0222.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1940__46_168899/}
}