@article{JRAM_1829__4_183161,
     author = {C. Gudermann},
     title = {Lehrsatz (zu beweisen).},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {100--100},
     year = {1829},
     volume = {4},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1829__4_183161/}
}