@misc{Buczek_Tomasz_Breeding_1995,
 author={Buczek, Tomasz and Keller, Marek ( –2012)},
 volume={29},
 editor={Polska Akademia Nauk. Muzeum i Instytut Zoologii},
 number={2},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1995},
 publisher={Muzeum i Instytut Zoologii PAN},
 language={eng},
 language={pol},
 type={Text},
 title={Breeding ecology of the Marsh Harrier Circus aeruginosus in eastern Poland. Cz. 1, Population numbers and phenology of the onset of laying},
 URL={http://rcin.org.pl/miiz/Content/42894/PDF/WA058_59892_P257-T29_Acta-Ornith-Nr-2-1.pdf},
 keywords={Marsh Harrier, Eurasian Marsh Harrier, Western Marsh Harrier, behaviour, reproduction, populations, counting, Poland, Eastern, phenology, ecology, breeding ecology, dynamic of numbers, birds of prey, birds, onset of laying, Circus aeruginosus, Accipitridae, Aves},
}