@article{MZ_1940__46_168895,
     author = {H., Geppert},
     title = {\"Uber einige {Kennzeichnungen} des {Kreises}},
     journal = {Mathematische Zeitschrift},
     pages = {117--128},
     publisher = {mathdoc},
     volume = {46},
     year = {1940},
     zbl = {0022.26601},
     url = {http://geodesic.mathdoc.fr/item/MZ_1940__46_168895/}
}