@article{MZ_1954__61_169446,
     author = {Walter Neumer},
     title = {Zur {Konstruktion} von {Ordnungszahlen.} {IV.}},
     journal = {Mathematische Zeitschrift},
     pages = {47--69},
     publisher = {mathdoc},
     volume = {61},
     year = {1954},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1954__61_169446/}
}