@article{JDM_1967__69_146556,
     author = {Horst Schubert},
     title = {Knoten.},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {184--190},
     publisher = {mathdoc},
     volume = {69},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/JDM_1967__69_146556/}
}