@misc{Schubert_Friedrich_Theodor_Populare_1804,
 author={Schubert, Friedrich Theodor},
 address={St. Petersburg},
 howpublished={online},
 year={1804},
 publisher={Akademie der Wissenschaften},
 language={ger},
 title={Populare Astronomie. Tl. 1},
 keywords={history of astronomy, spherical astronomy},
}