@misc{_Summarius,
 howpublished={online},
 publisher={Wietor, Hieronim. Druk.},
 language={lat},
 type={starodruki},
 title={Summarius computus ex variis computualibus libris [...] recollectus, cum additione declarationum capituli uniuscuiusque, denuo castigatus et revisus},
 keywords={matematyka 16w., kalendarze 16w.},
}