@article{JRAM_1869__70_148093,
     author = {G. Kirchhoff},
     title = {Zur {Theorie} freier {Fl\"ussigkeitsstrahlen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {289--298},
     publisher = {mathdoc},
     volume = {70},
     year = {1869},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1869__70_148093/}
}