@misc{Kepler_Johannes_(1571–1630)_Joannis,
 author={Kepler, Johannes (1571–1630)},
 address={Frankofurti a. M. et Erlangae},
 howpublished={online},
 publisher={Heyder and Zimmer},
 language={lat},
 title={Joannis Kepleri Astronomi Opera Omnia},
 type={text},
}