@article{JDM_1973__75_146630,
     author = {Norbert Knoche},
     title = {Erg\"anzung zu: },
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {144--150},
     publisher = {mathdoc},
     volume = {75},
     year = {1973},
     zbl = {0276.26016},
     url = {http://geodesic.mathdoc.fr/item/JDM_1973__75_146630/}
}