@article{MZ_1933__36_168416,
     author = {W., Nikliborc},
     title = {\"Uber die {Niveaukurven} logarithmischer {Fl\"achenpotentiale}},
     journal = {Mathematische Zeitschrift},
     pages = {647--654},
     year = {1933},
     volume = {36},
     zbl = {0007.01503},
     url = {http://geodesic.mathdoc.fr/item/MZ_1933__36_168416/}
}