@article{JDM_1961__63_146474,
     author = {Otto Volk},
     title = {Nachtrag zu },
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {52--52},
     publisher = {mathdoc},
     volume = {63},
     year = {1961},
     url = {http://geodesic.mathdoc.fr/item/JDM_1961__63_146474/}
}