@misc{_Polish_1989,
 copyright={Creative Commons Attribution BY-SA 4.0 license},
 address={Warsaw},
 howpublished={online},
 year={1989},
 type={Text},
 title={Polish Academy of Sciences. Institute of Dendrology Kórnik (near Poznań)},
 URL={http://rcin.org.pl./Content/159446/PDF/KOR001_193590.pdf},
 keywords={Institute of Dendrology, Polish Academy of Sciences, directory},
}