@misc{Michalski_Jacek_1998,
 author={Michalski, Jacek},
 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://www.rcin.org.pl/Content/194011/PDF/KOR001_155730.pdf},
 keywords={Norway spruce, Picea abies, gradation of the spruce bark beetle},
}