@article{JRAM_1827__2_183075,
     author = {Joseph L. Raabe},
     title = {Untersuchung \"uber die {Directrixen} der {Curven.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {330--334},
     publisher = {mathdoc},
     volume = {2},
     year = {1827},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1827__2_183075/}
}