@article{JRAM_1925__154_149557,
     author = {Lothar Koschmieder},
     title = {\"Uber die {Integration} zweier {Systeme} partieller {Differentialgleichungen} mittels der hypergeometrischen {Reihen} zweier {Ver\"anderlichen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {42--49},
     publisher = {mathdoc},
     volume = {154},
     year = {1925},
     zbl = {50.0324.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1925__154_149557/}
}