@misc{_Opis,
 editor={Polska Akademia Nauk. Zakład Dendrologii i Pomologii w Kórniku},
 copyright={Creative Commons Attribution BY-SA 4.0 license},
 howpublished={online},
 language={pol},
 type={Text},
 title={Opis drzewa doborowego. Olsza K-13-},
 URL={http://rcin.org.pl./Content/159885/PDF/KOR001_176893_Olsza-13.pdf},
 keywords={plus trees, chosen tree, selection of trees, genetics of forest trees, Alnus sp., alder},
}