@misc{Argelander_Friedrich_Wilhelm_August_Mittlere_1867,
 author={Argelander, Friedrich Wilhelm August},
 address={Bonn},
 howpublished={online},
 year={1867},
 publisher={Adolph Marcus},
 language={ger},
 title={Mittlere Oerter von 33811 Sternen},
 keywords={catalogue of stars, Bonn's observatory},
}