@misc{_Summarius,
 howpublished={online},
 publisher={Haller Jan},
 language={lat},
 type={starodruk},
 title={Summarius computus ex variis computualibus libris breviter recollectus cum additione declarationum capituli uniusquiusque denuo castigatus et revisus},
 keywords={matematyka 16w., kalendarze 16w.},
}