@article{MOMA_1980__89_177969,
     author = {Rolf Riesinger},
     title = {Entartete {Steinerkegelschnitte} in nichtpapposschen {Desarguesebenen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {243--252},
     year = {1980},
     volume = {89},
     zbl = {0432.51005},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1980__89_177969/}
}