@article{MM2_1972__6_154100,
     author = {G\"unter Frank},
     title = {Zur lokalen {Werteverteilung} der {L\"osungen} linearer {Differentialgleichungen.}},
     journal = {Manuscripta mathematica},
     pages = {381--404},
     publisher = {mathdoc},
     volume = {6},
     year = {1972},
     zbl = {0243.34009},
     url = {http://geodesic.mathdoc.fr/item/MM2_1972__6_154100/}
}