@article{JRAM_1838__18_147040,
     author = {O. Hesse},
     title = {Ueber {Oberfl\"achen} zweiter {Ordnung.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {101--118},
     year = {1838},
     volume = {18},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1838__18_147040/}
}