@misc{Opatowczyk_Adam_(1574-1647)_Qvæstio,
 author={Opatowczyk, Adam (1574-1647)},
 howpublished={online},
 publisher={Jakub Siebeneicher - Dziedzice},
 language={lat},
 title={Qvæstio De Natvra Materiæ Primæ},
 type={starodruk},
}