@article{BAG_1976__5_138130,
     author = {O. KR\"OTENHEERDT and S. VEIT},
     title = {Zur {Theorie} massiver {Knoten}},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {61--74},
     publisher = {mathdoc},
     volume = {5},
     year = {1976},
     zbl = {0348.50006},
     url = {http://geodesic.mathdoc.fr/item/BAG_1976__5_138130/}
}