@misc{_2011,
 copyright={Copyright by Wydawnictwo Uniwersytetu Wrocławskiego Sp. z o.o.},
 address={Wrocław},
 howpublished={online},
 year={2011},
 publisher={Wydawnictwo Uniwersytetu Wrocławskiego},
 language={pol},
 language={ger},
 keywords={National Insurance Institute of Silesia, insurance company, history},
}