@misc{Chałupka_Władysław_1975,
 author={Chałupka, Władysław},
 editor={Giertych, Maciej. Promotor},
 copyright={Creative Commons Attribution BY-SA 4.0 license},
 address={Kórnik},
 howpublished={online},
 year={1975},
 language={pol},
 type={Text},
 URL={http://www.rcin.org.pl/Content/148067/PDF/KOR001_156645_1975_Badania-nad-obfitosc.pdf},
 keywords={Picea abies, Norway spruce, flowering of Norway spruce},
}