@misc{Longomontanus_Christen_Sørensen_(1562-1647)_Cyclometria,
 author={Longomontanus, Christen Sørensen (1562-1647)},
 address={Kopenhaga},
 howpublished={online},
 language={lat},
 type={text},
 title={Cyclometria ex Lunulis reciproce demonstrata : Unde tam Areæ, quam Perimetri circuli exacta dimensio & in numeros diductio seqvuta est, hactenus ab omnibus Mathematicis unice desiderata [...] / Inventore Christiano S. Longomontano [...].},
}