@misc{Szarek-Łukaszewska_Grażyna_Contamination_2007,
 author={Szarek-Łukaszewska, Grażyna},
 volume={Nr 54 cz. I},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Studia Naturae},
 howpublished={online},
 year={2007},
 publisher={Institute of Nature Conservation of the Polish Academy of Sciences},
 language={pol},
 type={Text},
 title={Contamination of national parks in Poland - changes in time},
 URL={http://rcin.org.pl/Content/119457/PDF/KR038_124850_r2007-t54-1_SN-Szarek-189-199.pdf},
 keywords={heavy metals - environmental aspect, tropospheric ozone},
}