@article{MZ_1972__126_171724,
     author = {Horst Herold},
     title = {Ein {Vergleichssatz} f\"ur komplexe lineare {Differentialgleichungen.}},
     journal = {Mathematische Zeitschrift},
     pages = {91--94},
     publisher = {mathdoc},
     volume = {126},
     year = {1972},
     zbl = {0226.34005},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__126_171724/}
}