@article{JDM_1943__53_146338,
     author = {Walter Wunderlich},
     title = {\"Uber den },
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {41--48},
     publisher = {mathdoc},
     volume = {53},
     year = {1943},
     zbl = {0061.38906},
     url = {http://geodesic.mathdoc.fr/item/JDM_1943__53_146338/}
}