@misc{Krüger_Piotr_Petri,
 author={Krüger, Piotr},
 howpublished={online},
 publisher={Hünefeld Andrzej},
 language={lat},
 title={Petri Crügeri Mathematici Dantiscani Doctrina Astronomiæ Sphærica: Præceptis methodicis & perspicuis, per Globum, Tabulas, Trigonometriam, tam Veterem quam Logarithmicam, explicata ac demonstrata, Cum Tabulis Ad Eam Pertinentibus},
 keywords={astronomia 17w.},
}