@misc{Olbers_Wilhelm_Wilhelm_1894,
 author={Olbers, Wilhelm},
 address={Berlin},
 howpublished={online},
 year={1894},
 publisher={Verlag von Julius Springer},
 language={ger},
 type={text},
 title={Wilhelm Olbers sein Leben und seine Werke. Bd. 1},
 keywords={Olbers, Wilhelm, planetary system, comets since 1535 for 1835 year},
}