@misc{Hecker_Johannes_Johannis,
 author={Hecker, Johannes},
 howpublished={online},
 publisher={Hecker, Johannes},
 language={lat},
 type={starodruki},
 title={Johannis Heckeri Motuum caelestium ephemerides ab anno 1666 [rz.] ad 1680 [rz.]. Ex observationibus correctis [...] Tychonis Brahei, et Joh. Kepleri hypothesibus [...]},
 keywords={astronomia 17w.},
}