@article{MAN_1891__39_157576,
     author = {J. Horn},
     title = {Zur {Theorie} der {Systeme} linearer {Differentialgleichungen} mit einer unabh\"angigen {Ver\"anderlichen.} {I}},
     journal = {Mathematische Annalen},
     pages = {391--408},
     publisher = {mathdoc},
     volume = {39},
     year = {1891},
     zbl = {23.0325.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1891__39_157576/}
}