@article{MZ_1931__33_168296,
     author = {A., Walther},
     title = {Der {Kreis} durch drei {Punkte}},
     journal = {Mathematische Zeitschrift},
     pages = {796--800},
     publisher = {mathdoc},
     volume = {33},
     year = {1931},
     zbl = {0002.02302},
     url = {http://geodesic.mathdoc.fr/item/MZ_1931__33_168296/}
}