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@article{MAN_1886__27_157215, author = {Staude}, title = {Ueber neue {Focaleigenschaften} der {Fl\"achen} 2. {Grades}}, journal = {Mathematische Annalen}, pages = {253--271}, publisher = {mathdoc}, volume = {27}, year = {1886}, zbl = {18.0755.02}, url = {http://geodesic.mathdoc.fr/item/MAN_1886__27_157215/} }
Staude. Ueber neue Focaleigenschaften der Flächen 2. Grades. Mathematische Annalen, Tome 27 (1886), pp. 253-271. http://geodesic.mathdoc.fr/item/MAN_1886__27_157215/