@misc{_Acta_1990,
 volume={Vol. 31},
 number={3/4},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 journal={Acta Hydrobiologica},
 address={Warszawa},
 address={Kraków},
 howpublished={online},
 year={1990},
 publisher={Institute of Freshwater Biology of the Polish Academy of Sciences},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 type={Text},
 title={Acta Hydrobiologica Vol. 31 Fasc. 3/4 (1990)},
}