@article{MAN_1949__121_160175,
     author = {Emanuel Sperner},
     title = {Die {Ordnungsfunktionen} einer {Geometrie}},
     journal = {Mathematische Annalen},
     pages = {107--130},
     publisher = {mathdoc},
     volume = {121},
     year = {1949},
     zbl = {0032.17801},
     url = {http://geodesic.mathdoc.fr/item/MAN_1949__121_160175/}
}