@misc{Żurek_Roman_Równania_2006, author={Żurek, Roman}, copyright={Creative Commons Attribution BY 3.0 PL license}, address={Kraków}, howpublished={online}, year={2006}, publisher={Institute of Nature Conservation of the Polish Academy of Sciences}, language={pol}, title={Równania do obliczeń wagi ryb}, title={Equations for fishes biomass calculation}, type={Text}, URL={http://rcin.org.pl/Content/148704/PDF/KR038_173169_r2006_Ichtiof-Zurek-158-161.pdf}, keywords={ichthyofauna, freshwater biology}, }