@misc{Boratyński_Adam_Betula_1980-1984,
 author={Boratyński, Adam},
 copyright={Creative Commons Attribution BY-SA 4.0 license},
 howpublished={online},
 year={1980-1984},
 title={Betula obscura Kotula ex Fiek},
 type={Image},
 URL={http://www.rcin.org.pl/Content/190611/PDF/KOR001_224075_1980-1984_Betula-o.pdf},
 keywords={botanical drawings},
}