@article{MAN_1933__108_159624,
     author = {P. Thullen and H. Behnke},
     title = {Zur {Theorie} der {Singularit\"aten} der {Funktionen} mehrerer komplexen {Ver\"anderlichen.} {Das} {Konvergenzproblem} der {Regularit\"atsh\"ullen}},
     journal = {Mathematische Annalen},
     pages = {91--104},
     publisher = {mathdoc},
     volume = {108},
     year = {1933},
     zbl = {0006.17202},
     url = {http://geodesic.mathdoc.fr/item/MAN_1933__108_159624/}
}