@misc{Żurek_Roman_Gatunki_2006,
 author={Żurek, Roman},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 howpublished={online},
 year={2006},
 publisher={Institute of Nature Conservation of the Polish Academy of Sciences},
 language={pol},
 title={Gatunki obce - zarys problemu},
 title={Invading species - an outline of problem},
 type={Text},
 URL={http://www.rcin.org.pl/Content/148694/PDF/KR038_173168_r2006_Ichtiof-Zurek-137-144.pdf},
 keywords={ichthyofauna, freshwater biology, alien species, introduction of alien species},
}