@article{JRAM_1931__164_149760,
     author = {Wilhelm Kirchhoff},
     title = {Reduktion simultaner partieller {Differentialgleichungen} bei hydrodynamischen {Problemen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {183--195},
     publisher = {mathdoc},
     volume = {164},
     year = {1931},
     zbl = {0001.24001},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1931__164_149760/}
}