@article{JRAM_1871__73_148150,
     author = {R. Hoppe},
     title = {Vibrationen eines {Ringes} in seiner {Ebene.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {158--170},
     year = {1871},
     volume = {73},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1871__73_148150/}
}