@misc{Michalik_Stefan_Przyczyny_1997,
 author={Michalik, Stefan and Michalik, Ryszard},
 volume={R. 54},
 editor={Institute of Nature Conservation of the Polish Academy of Sciences},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Protection of Nature},
 howpublished={online},
 year={1997},
 language={pol},
 type={Text},
 title={Przyczyny zanikania i aktywna ochrona Osmunda regalis L. w rezerwacie "Długosz Królewski"},
 title={Causes of the extinction of Osmunda regalis L. and its active protection in the Długosz Królewski reserve},
 URL={http://rcin.org.pl/Content/121352/PDF/KR038_113457_r1997-r54_OP-Michalik-91-101.pdf},
 keywords={Niepołomice Forest, Długosz Królewski Reserve, royal fern, Osmunda regalis},
}