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@article{MAN_1886__28_157252, author = {Sturm}, title = {Ueber h\"ohere r\"aumliche {Nullsysteme.}}, journal = {Mathematische Annalen}, pages = {277--283}, publisher = {mathdoc}, volume = {28}, year = {1886}, zbl = {18.0541.02}, url = {http://geodesic.mathdoc.fr/item/MAN_1886__28_157252/} }
Sturm. Ueber höhere räumliche Nullsysteme.. Mathematische Annalen, Tome 28 (1886), pp. 277-283. http://geodesic.mathdoc.fr/item/MAN_1886__28_157252/