@article{JRAM_1898__119_149055,
     author = {Paul St\"ackel},
     title = {Ueber die {Existenz} von {Integralen} bei {Systemen} partieller {Differentialgleichungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {339--346},
     publisher = {mathdoc},
     volume = {119},
     year = {1898},
     zbl = {29.0299.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1898__119_149055/}
}