@misc{Witkowski_Andrzej_(1947–2017)_The_1985,
 author={Witkowski, Andrzej (1947–2017)},
 volume={Vol. 25/26},
 number={3/4},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 address={Kraków},
 journal={Acta Hydrobiologica},
 howpublished={online},
 year={1985},
 publisher={Institute of Freshwater Biology of the Polish Academy of Sciences},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 type={Text},
 title={The structure of groups and the numbers of fish populations in the River Nysa Kłodzka upper catchment basin},
 title={Struktury zgrupowań i liczebność populacji ryb w górnym dorzeczu Nysy Kłodzkiej},
 URL={http://www.rcin.org.pl/Content/207871/PDF/KR038_174253_r1983-4-t25-26-no3-4_AH-Witkowski-429-449.pdf},
}