@misc{Chełkowska_H._Variations_1978,
 author={Chełkowska, H.},
 volume={23},
 number={11},
 copyright={Rights Reserved - Free Access},
 journal={Acta Theriologica},
 address={Białowieża},
 howpublished={online},
 year={1978},
 language={eng ; sum. eng. ; pol.},
 title={Variations in numbers and social factors in a population of field voles},
 type={Text},
 URL={http://rcin.org.pl/Content/10496/PDF/BI002_2613_Cz-40-2_Acta-T23-nr11-213-238_o.pdf},
 keywords={age structure, density, Microtus arvalis, migration, numbers, population, social factors, survival, variations, Nornik polny, dynamika liczebności, czynniki socjalne, tempo wzrostu populacji},
}