@article{JRAM_1837__17_147011,
     author = {C.G.J. Jacobi},
     title = {Zur {Theorie} der {Variations-Rechnung} und der {Differential-Gleichungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {68--82},
     year = {1837},
     volume = {17},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1837__17_147011/}
}