@article{JRAM_1834__12_146891,
     author = {C. Gudermann},
     title = {Lehrs\"atze, zu beweisen.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {82--88},
     year = {1834},
     volume = {12},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1834__12_146891/}
}