@article{JRAM_1868__69_148053,
     author = {R. Lipschitz},
     title = {Beitrag zur {Theorie} der linearen partiellen {Differentialgleichungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {109--127},
     publisher = {mathdoc},
     volume = {69},
     year = {1868},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1868__69_148053/}
}