@misc{Panek_Marek_Use_1998,
 author={Panek, Marek},
 volume={33},
 editor={Polska Akademia Nauk. Muzeum i Instytut Zoologii},
 number={3-4},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1998},
 publisher={Muzeum i Instytut Zoologii PAN},
 language={eng},
 language={pol},
 type={Text},
 title={Use of call counts for estimating spring density of the grey patridge Perdix perdix},
 URL={http://rcin.org.pl/Content/43594/PDF/WA058_60648_P257-T33_Acta-Ornith-Nr-2-7.pdf},
 keywords={Gray Partridge, Partridge, Poland, population density, bird census methods, voice, vocal activity, birds, Perdix perdix, Phasianidae, Aves, 1988-94},
}