@misc{Kepler_Johannes_(1571-1630)_Joannis_1859,
 author={Kepler, Johannes (1571-1630)},
 address={Frankofurti a. M. et Erlangae},
 howpublished={online},
 year={1859},
 publisher={Heyder and Zimmer},
 language={lat},
 type={text},
 title={Joannis Kepleri Astronomi Opera Omnia. Vol. II},
 keywords={Kepler optics, Kepler's First Law},
}