@misc{Bessel_Friedrich_Wilhelm_Abhandlungen_1875,
 author={Bessel, Friedrich Wilhelm},
 address={Leipzig},
 howpublished={online},
 year={1875},
 publisher={Verlag von Wilhelm Engelmann},
 language={ger},
 type={text},
 title={Abhandlungen von Friedrich Wilhelm Bessel. Bd. 1},
 keywords={solar system, spherical astronomy},
}