@misc{Oleś_Tadeusz_Observations_1993,
 author={Oleś, Tadeusz},
 volume={49},
 number={1},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Let's protect Our Indigenous Nature},
 howpublished={online},
 year={1993},
 publisher={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences},
 language={pol},
 type={Text},
 title={Observations concerning the vanishing birds in the protective belt of the Pieniny National Park},
 URL={http://www.rcin.org.pl/Content/69139/PDF/KR038_88250_r1993-t49-no1_ChPO-Oles-62.pdf},
 keywords={birds},
}