@article{MZ_1956__65_169591,
     author = {Horst Schubert},
     title = {Knoten mit zwei {Br\"ucken.}},
     journal = {Mathematische Zeitschrift},
     pages = {133--170},
     year = {1956},
     volume = {65},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1956__65_169591/}
}