@article{ELMA_1947__2_140464,
     author = {Ernst Trost},
     title = {Eine kennzeichnende {Eigenschaft} des {Kreises.}},
     journal = {Elemente der Mathematik},
     pages = {76--80},
     publisher = {mathdoc},
     volume = {2},
     year = {1947},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1947__2_140464/}
}