@article{JRAM_1869__71_148122,
     author = {T. Schubert},
     title = {Zur {Theorie} der {Charakteristiken.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {366--386},
     publisher = {mathdoc},
     volume = {71},
     year = {1869},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1869__71_148122/}
}