@misc{Chałupka_Władysław_1998,
 author={Chałupka, Władysław},
 editor={Boratyński, Adam. Redaktor},
 editor={Bugała, Władysław. Redaktor},
 editor={Polska Akademia Nauk. Instytut Dendrologii},
 copyright={Creative Commons Attribution BY-SA 4.0 license},
 address={Poznań},
 howpublished={online},
 year={1998},
 publisher={Bogucki Wydawnictwo Naukowe},
 language={mul},
 type={Text},
 URL={http://rcin.org.pl/Content/194003/PDF/KOR001_155692.pdf},
 keywords={Norway spruce, Picea abies, flowering of Norway spruce, seed bearing of Norway spruce},
}