Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1926__25_167893, author = {K. B\"ogel}, title = {\"Uber partiell differenzierbare {Funktionen}}, journal = {Mathematische Zeitschrift}, pages = {490--498}, publisher = {mathdoc}, volume = {25}, year = {1926}, zbl = {52.0241.06}, url = {http://geodesic.mathdoc.fr/item/MZ_1926__25_167893/} }
K. Bögel. Über partiell differenzierbare Funktionen. Mathematische Zeitschrift, Tome 25 (1926), pp. 490-498. http://geodesic.mathdoc.fr/item/MZ_1926__25_167893/