@misc{Witkowski_Zbigniew_On_1989,
 author={Witkowski, Zbigniew},
 volume={45},
 editor={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences},
 number={3},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 journal={Let's protect Our Indigenous Nature},
 address={Warszawa},
 address={Kraków},
 howpublished={online},
 year={1989},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 title={On the occurrence of the butterflies: Parnassius apollo and Parnassius mnemosyne in the Pieniny National Park},
 type={Text},
 URL={http://rcin.org.pl/Content/73802/PDF/KR038_91109_r1989-t45-no3_ChPO-Witkowski-53-56.pdf},
 keywords={butterflies, Pieniny National Park, Parnassius apollo, Parnassius mnemosyne},
}