@article{MZ_1929__29_168072,
     author = {G. Rasch and Einar Hille},
     title = {\"Uber die {Nullstellen} der unvollst\"andigen {Gammafunktion} {P} (z, ?) {II.} {Geometrisches} \"uber die {Nullstellen}},
     journal = {Mathematische Zeitschrift},
     pages = {319--334},
     publisher = {mathdoc},
     volume = {29},
     year = {1929},
     zbl = {54.0388.03},
     url = {http://geodesic.mathdoc.fr/item/MZ_1929__29_168072/}
}