@misc{Kajak_Zdzisław_Ecology_1990,
 author={Kajak, Zdzisław},
 volume={37},
 number={3-4},
 editor={Polska Akademia Nauk. Instytut Ekologii},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 journal={Ekologia Polska},
 howpublished={online},
 year={1990},
 publisher={Polish Scientific Publishers},
 language={eng},
 type={Text},
 title={Ecology of two reservoirs (Central Poland) and water quality of Vistula and its tributaries. Preface},
 URL={http://rcin.org.pl/Content/81782/PDF/WA058_88119_P2840-T37_Eko-Pol-A-Nr-3-4.pdf},
 keywords={Vistula River, water quality, Central Poland},
}