@misc{Boratyński_Adam_Alnus_1980,
 author={Boratyński, Adam},
 copyright={Creative Commons Attribution BY-SA 4.0 license},
 howpublished={online},
 year={1980},
 title={Alnus hirsuta (Spach) Rupr.},
 type={Image},
 URL={http://www.rcin.org.pl/Content/206399/PDF/KOR001_226340_Alnus%20hirsuta%20(Spach).pdf},
 keywords={fruit structure, Siberian alder},
}