@article{JRAM_1846__30_147276,
     author = {H. Umpfenbach},
     title = {Ein {Lehrsatz} von {Kegelschnitten.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {95--96},
     publisher = {mathdoc},
     volume = {30},
     year = {1846},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1846__30_147276/}
}