@article{JDM_1962__65_146499,
     author = {Karl B\"ogel},
     title = {\"Uber die mehrdimensionale {Differentiation.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {45--71},
     publisher = {mathdoc},
     volume = {65},
     year = {1962},
     zbl = {0111.05901},
     url = {http://geodesic.mathdoc.fr/item/JDM_1962__65_146499/}
}