@misc{_Summarius,
 copyright={PAN Biblioteka Kórnicka},
 howpublished={online},
 publisher={Scharffenberg Maciej},
 language={lat},
 type={starodruki},
 title={Summarius computus ex varijs computualibus libris [...] recollectus [...] denuo castigatus et revisus},
 keywords={Polonicum 16w., matematyka 16w., kalendarz 16w.},
}