@article{MOMA_1969__73_177482,
     author = {Rolf Wallisser},
     title = {Zur {Transzendenz} der {Werte} der {Exponentialfunktion.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {449--460},
     publisher = {mathdoc},
     volume = {73},
     year = {1969},
     zbl = {0186.36603},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1969__73_177482/}
}