@misc{Donadt_Alfred_(1857–_)_Das_1881,
 author={Donadt, Alfred (1857– )},
 copyright={Public Domain},
 address={Leipzig},
 howpublished={online},
 year={1881},
 publisher={Johann Ambrosius Barth},
 language={ger},
 type={Text},
 title={Das mathematische Raumproblem und die geometrischen Axiome},
 URL={http://www.rcin.org.pl/impan/Content/13571/PDF/WA35_19150_6374_Das-mathematische.pdf},
}