@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)}, }