@misc{Klasa_Anna_Lutra_1999,
 author={Klasa, Anna and Wiśniowski, Bogdan},
 volume={55},
 number={3},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Let's protect Our Indigenous Nature},
 howpublished={online},
 year={1999},
 publisher={Institute of Nature Conservation of the Polish Academy of Sciences},
 language={pol},
 type={Text},
 title={Lutra lutra in the Ojców National Park},
 URL={http://rcin.org.pl/Content/141251/PDF/KR038_166343_r1999-t55-no3_ChPO-Klasa-104-106.pdf},
 keywords={Ojców National Park (Ojców, Poland), otter, Lutra lutra},
}