@misc{Grüm_Leszek_Seasonal_1966,
 author={Grüm, Leszek},
 volume={12},
 editor={Polska Akademia Nauk. Komitet Ekologiczny},
 number={2},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 journal={Ekologia Polska. Seria B},
 howpublished={online},
 year={1966},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 type={Text},
 title={Seasonal changes in density and number of individuals captured of Pterostichus niger Schall. (Carabidae, Coleoptera)},
 URL={http://www.rcin.org.pl/Content/124592/PDF/WA058_101013_P3259-12_Eko-Pol-B.pdf},
 keywords={population density, Pterostichus niger},
}