@article{MZ_1926__24_174981,
     author = {W. Blaschke and E. Landau},
     title = {Eine {Kennzeichnung} der {Kreise} auf der {Kugel.}},
     journal = {Mathematische Zeitschrift},
     pages = {191--191},
     publisher = {mathdoc},
     volume = {24},
     year = {1926},
     zbl = {51.0549.03},
     url = {http://geodesic.mathdoc.fr/item/MZ_1926__24_174981/}
}