@misc{_Acta_1989,
 volume={Vol. 31},
 number={1/2},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 address={Kraków},
 journal={Acta Hydrobiologica},
 howpublished={online},
 year={1989},
 publisher={Institute of Freshwater Biology of the Polish Academy of Sciences},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 language={pol},
 type={Text},
 title={Acta Hydrobiologica Vol. 31 Fasc. 1/2 (1989)},
}