@misc{Witkowski_Andrzej_(1947–2017)_Introduction_2002,
 author={Witkowski, Andrzej (1947–2017)},
 volume={Vol. 59 (2)},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Nature Conservation},
 howpublished={online},
 year={2002},
 publisher={Institute of Nature Conservation of the Polish Academy of Sciences},
 language={eng},
 type={Text},
 title={Introduction of fishes into Poland: benefaction or plague?},
 URL={http://rcin.org.pl./Content/115236/PDF/KR038_114341_r2002-t59-no2_NC-Witkowski-41-52.pdf},
 keywords={Fishes - Poland, introduction, invasive alien species},
}