@article{MAN_1873__6_156595,
     author = {A. Clebsch},
     title = {Zur {Theorie} der {Charakteristiken}},
     journal = {Mathematische Annalen},
     pages = {1--15},
     publisher = {mathdoc},
     volume = {6},
     year = {1873},
     url = {http://geodesic.mathdoc.fr/item/MAN_1873__6_156595/}
}