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@article{MZ_1929__29_168091, author = {J. Popken}, title = {Zur {Transzendenz} von e.}, journal = {Mathematische Zeitschrift}, pages = {525--541}, publisher = {mathdoc}, volume = {29}, year = {1929}, language = {de}, url = {http://geodesic.mathdoc.fr/item/MZ_1929__29_168091/} }
J. Popken. Zur Transzendenz von e.. Mathematische Zeitschrift, Tome 29 (1929), pp. 525-541. http://geodesic.mathdoc.fr/item/MZ_1929__29_168091/