@article{MZ_1933__36_168394,
     author = {St., Bergmann},
     title = {\"Uber den {Wertevorrat} einer {Funktion} von zwei komplexen {Ver\"anderlichen}},
     journal = {Mathematische Zeitschrift},
     pages = {171--183},
     publisher = {mathdoc},
     volume = {36},
     year = {1933},
     zbl = {58.0352.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1933__36_168394/}
}