@article{MZ_1954__61_169462,
     author = {Horst Schubert},
     title = {\"Uber eine numerische {Knoteninvariante.}},
     journal = {Mathematische Zeitschrift},
     pages = {245--288},
     year = {1954},
     volume = {61},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1954__61_169462/}
}