@misc{_Nicolaus,
 address={[s.l.]},
 howpublished={online},
 publisher={[s.n.]},
 language={eng},
 type={druk},
 title={Nicolaus Copernicus 1473-1543 : father of modern astronomy : mathematican, physician economist and astronomer},
 keywords={Kopernik, Mikołaj (1473-1543)},
}