@misc{Kepler_Johannes_(1571-1630)_Joannis_1868,
 author={Kepler, Johannes (1571-1630)},
 address={Frankofurti a. M. et Erlangae},
 howpublished={online},
 year={1868},
 publisher={Heyder and Zimmer},
 language={lat},
 type={text},
 title={Joannis Kepleri Astronomi Opera Omnia. Vol. VII},
 keywords={comets, ephemeris of celestial bodies},
}