@article{JRAM_1885__98_148606,
     author = {W. Heymann},
     title = {Ueber eine {Transformation} bei linearen simultanen {Differentialgleichungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {241--243},
     publisher = {mathdoc},
     volume = {98},
     year = {1885},
     zbl = {17.0331.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1885__98_148606/}
}