@misc{Staszkiewicz_Jerzy_The_1986,
 author={Staszkiewicz, Jerzy and Wójcicki, Jan J.},
 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 last twenty years in the history of the birch Betula x oycoviensis Besser (pro spec.) in the environs of Cracow},
 type={Text},
 URL={http://www.rcin.org.pl/Content/87765/PDF/KR038_109123_r1986-t42-no4_ChPO-Staszkiewicz-30-37.pdf},
 keywords={birch, Betula oycoviensis},
}