@article{JRAM_1892__109_148846,
     author = {Leo K\"onigsberger},
     title = {Ueber die {Integrale} partieller {Differentialgleichungssysteme} beliebiger {Ordnung.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {261--340},
     publisher = {mathdoc},
     volume = {109},
     year = {1892},
     zbl = {24.0319.03},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1892__109_148846/}
}