@article{JRAM_1871__73_148154,
     author = {O. Hermes and F. Joachimsthal},
     title = {Notiz \"uber die {Normalen} einer {Fl\"ache} des zweiten {Grades.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {207--208},
     publisher = {mathdoc},
     volume = {73},
     year = {1871},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1871__73_148154/}
}