@misc{Johannes_de_Sacrobosco_(c._1195_–_1256)_Algorismus,
 author={Johannes de Sacrobosco (c. 1195 – 1256) and http://viaf.org/viaf/44151776764918011946},
 howpublished={online},
 language={lat},
 type={text},
 title={Algorismus vulgaris (Algorismus de integris sive Tractatus de arte numerandi)},
 keywords={15 w., matematyka},
}