@misc{_Acta_1987,
 editor={Polska Akademia Nauk. Instytut Zoologii},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1987},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 language={pol},
 language={rus},
 title={Acta Ornithologica, vol. 23 (1987)},
 type={Text},
 URL={http://rcin.org.pl/Content/41611/PDF/WA058_31709_P257-T23_Acta-Ornith-Spis-t23.pdf},
 keywords={Poland, birds, periodicals, ornithology},
}