@article{JRAM_1880__89_183423,
     author = {E. Hunyady},
     title = {Beitrag zur {Theorie} der {Fl\"achen} zweiten {Grades.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {47--69},
     publisher = {mathdoc},
     volume = {89},
     year = {1880},
     zbl = {12.0503.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1880__89_183423/}
}