@misc{_Opis_1959,
 editor={Polska Akademia Nauk. Zakład Dendrologii i Pomologii w Kórniku},
 copyright={Creative Commons Attribution BY-SA 4.0 license},
 howpublished={online},
 year={1959},
 language={pol},
 title={Opis drzewa doborowego. Olcha K-03-},
 type={Text},
 URL={http://rcin.org.pl/Content/159767/PDF/KOR001_176891_Olcha-03.pdf},
 keywords={plus trees, chosen tree, selection of trees, genetics of forest trees, Alnus sp., alder},
}