@misc{Kajak_Zdzisław_Preface_1986,
 author={Kajak, Zdzisław},
 volume={33},
 editor={Polska Akademia Nauk. Instytut Ekologii},
 number={3},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 journal={Ekologia Polska},
 howpublished={online},
 year={1986},
 publisher={Polish Scientific Publishers},
 language={eng},
 type={Text},
 title={Preface},
 URL={http://rcin.org.pl/miiz/Content/70163/PDF/WA058_87282_P2840-T33_Eko-Pol-A-Nr-3.pdf},
 keywords={rivers ecology, Poland},
}