@article{MZ_1981__176_183642,
     author = {Norbert Steinmetz},
     title = {\"Uber die {Nullstellen} von {Differentialpolynomen.}},
     journal = {Mathematische Zeitschrift},
     pages = {255--264},
     year = {1981},
     volume = {176},
     zbl = {0466.30026},
     url = {http://geodesic.mathdoc.fr/item/MZ_1981__176_183642/}
}