@article{MZ_1926__24_174974,
     author = {Haupt and E Hilb},
     title = {\"Uber {Liouvillesche} {Mannigfaltigkeiten}},
     journal = {Mathematische Zeitschrift},
     pages = {105--124},
     publisher = {mathdoc},
     volume = {24},
     year = {1926},
     zbl = {51.0576.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1926__24_174974/}
}