@misc{Michalik_Stefan_The_1989,
 author={Michalik, Stefan},
 volume={45},
 editor={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences},
 number={1},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 journal={Let's protect Our Indigenous Nature},
 address={Warszawa},
 address={Kraków},
 howpublished={online},
 year={1989},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 title={The endangered and the threatened species of the Polish flora: the problems of their protection},
 type={Text},
 URL={http://www.rcin.org.pl/Content/84496/PDF/KR038_107296_r1989-t45-no1_ChPO-Michalik-5-20.pdf},
}