@article{JRAM_1855__50_147603,
     author = {J.L. Raabe},
     title = {Bemerkungen \"uber {Directrix-} und {Fu{\ss}punctenlinien.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {189--193},
     publisher = {mathdoc},
     volume = {50},
     year = {1855},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1855__50_147603/}
}