@article{MAN_1978__237_182777,
     author = {Volker Dietrich},
     title = {Zur {Reduktion} von linearen {Differentialgleichungssystemen.}},
     journal = {Mathematische Annalen},
     pages = {79--96},
     publisher = {mathdoc},
     volume = {237},
     year = {1978},
     zbl = {0386.34012},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__237_182777/}
}