@misc{Olaczek_Romuald_The_1986,
 author={Olaczek, Romuald},
 volume={42},
 editor={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences},
 number={4},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 journal={Let's protect Our Indigenous Nature},
 address={Warszawa},
 address={Kraków},
 howpublished={online},
 year={1986},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 title={The birch Betula obscura died out in the "Bujny" nature reserve},
 type={Text},
 URL={http://rcin.org.pl/Content/83819/PDF/KR038_104806_r1986-t42-no4_ChPO-Olaczek-67-70.pdf},
 keywords={Betula obscura},
}