@article{JRAM_1836__15_146967,
     author = {C.G.J. Jacobi},
     title = {Observationes geometricae.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {309--312},
     publisher = {mathdoc},
     volume = {15},
     year = {1836},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1836__15_146967/}
}