@misc{Helwig_Martin_(1516-1574)_M.,
 author={Helwig, Martin (1516-1574)},
 address={Bresslau},
 howpublished={online},
 publisher={Straubel},
 language={ger},
 language={lat},
 title={M. Martin Helwigs Erste Land=Charte vom Herzogthum Schlesien},
 keywords={18 w., Śląsk - geografia},
}