@misc{Witkowski_Zbigniew_The_1991,
 author={Witkowski, Zbigniew and Oleś, Tadeusz},
 volume={47},
 number={4},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Let's protect Our Indigenous Nature},
 howpublished={online},
 year={1991},
 publisher={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences},
 language={pol},
 type={Text},
 title={The butterfly Parnassius apollo frankenbergi: the state of its population in the Pieniny National Park},
 URL={http://rcin.org.pl/Content/68956/PDF/KR038_88222_r1991-t47-no4_ChPO-Witkowski-62-64.pdf},
 keywords={Pieniny National Park, Parnassius apollo},
}