@article{MAN_1903__56_158077,
     author = {Karl Boehm},
     title = {Zur {Integration} partieller {Differentialgleichungen}},
     journal = {Mathematische Annalen},
     pages = {585--614},
     publisher = {mathdoc},
     volume = {56},
     year = {1903},
     zbl = {34.0380.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1903__56_158077/}
}