@article{MOMA_1951__55_176851,
     author = {Hermann B\"oheim},
     title = {Kr\"ummungskreise und {Evoluten} reeller {Kegelschnitte} bei {Cayley-Klein'scher} {Metrik.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {43--53},
     publisher = {mathdoc},
     volume = {55},
     year = {1951},
     zbl = {0044.35303},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1951__55_176851/}
}