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@article{MAN_1990__287_1_164711, author = {H. Herold}, title = {Nichteuklidischer {Nullstellenabstand} der {L\"osungen} von w'' + p(z)w = 0.}, journal = {Mathematische Annalen}, pages = {637--642}, publisher = {mathdoc}, volume = {287}, number = {1}, year = {1990}, zbl = {0717.34013}, url = {http://geodesic.mathdoc.fr/item/MAN_1990__287_1_164711/} }
H. Herold. Nichteuklidischer Nullstellenabstand der Lösungen von w'' + p(z)w = 0.. Mathematische Annalen, Tome 287 (1990) no. 1, pp. 637-642. http://geodesic.mathdoc.fr/item/MAN_1990__287_1_164711/