@article{MAN_1886__27_157215,
     author = {Staude},
     title = {Ueber neue {Focaleigenschaften} der {Fl\"achen} 2. {Grades}},
     journal = {Mathematische Annalen},
     pages = {253},
     publisher = {mathdoc},
     volume = {27},
     year = {1886},
     zbl = {18.0755.02},
     language = {un},
     url = {https://geodesic-test.mathdoc.fr/item/MAN_1886__27_157215/}
}