@article{JRAM_1885__98_148614,
     author = {E. Gr\"unfeld},
     title = {Zur {Theorie} der linearen {Differentialgleichungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {333--348},
     publisher = {mathdoc},
     volume = {98},
     year = {1885},
     zbl = {17.0292.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1885__98_148614/}
}