@article{JRAM_1892__109_148842,
     author = {Lothar Heffter},
     title = {Bemerkung \"uber die {Integrale} linearer {Differentialgleichungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {222--224},
     publisher = {mathdoc},
     volume = {109},
     year = {1892},
     zbl = {24.0288.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1892__109_148842/}
}