@misc{Boratyński_Adam_Betula_1980,
 author={Boratyński, Adam},
 copyright={Creative Commons Attribution BY-SA 4.0 license},
 howpublished={online},
 year={1980},
 title={Betula pubescens Ehrh.},
 type={Image},
 URL={http://www.rcin.org.pl/Content/190583/PDF/KOR001_224740_1980_Betula-pubescens-Ehr.pdf},
 keywords={flower strukture, fruit structure, Betulaceae, Betula pubescens, brown birch},
}