@article{JRAM_1865__64_147952,
     author = {E.B. Christoffel},
     title = {Zur {Theorie} der einwerthigen {Potentiale.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {321--368},
     year = {1865},
     volume = {64},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1865__64_147952/}
}