@misc{Boratyński_Adam_Empetrum_1980-1984,
 author={Boratyński, Adam},
 copyright={Creative Commons Attribution BY-SA 4.0 license},
 howpublished={online},
 year={1980-1984},
 type={Image},
 title={Empetrum nigrum subsp. hermaphroditum (Hagerup) Bocher},
 URL={http://www.rcin.org.pl/Content/190867/PDF/KOR001_224377_1980-1984_Empetrum-nigrum-subs.pdf},
 keywords={botanical drawings, black crowberry, bisexual tetraploid subspecies},
}