@misc{_Protection_1991,
 volume={R. 48},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Protection of Nature},
 howpublished={online},
 year={1991},
 publisher={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences},
 language={eng},
 language={pol},
 type={Text},
 title={Protection of Nature Ann. 48 (1991)},
}