@misc{Staszkiewicz_Jerzy_Betula_2014,
 author={Staszkiewicz, Jerzy},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 howpublished={online},
 year={2014},
 publisher={Institute of Nature Conservation of the Polish Academy of Sciences},
 language={pol},
 type={Text},
 title={Betula ×oycoviensis Besser (pro species) Brzoza ojcowska},
 URL={http://rcin.org.pl/Content/126915/PDF/KR038_149440_r2014_PCzKR-Staszkiewicz-89-90.pdf},
 keywords={red data book, flowering plants, Anthophyta, Betula oycoviensis},
}