@misc{_Acta_1987, volume={23}, editor={Polska Akademia Nauk. Instytut Zoologii}, number={2}, copyright={Rights Reserved - Free Access}, journal={Acta Ornithologica}, address={Warszawa}, howpublished={online}, year={1987}, publisher={Państwowe Wydawnictwo Naukowe}, language={eng}, language={pol}, language={rus}, type={Text}, title={Acta Ornithologica ; vol. 23, no 2 - Spis treści}, URL={http://rcin.org.pl./Content/41731/PDF/WA058_57179_P257-T23_Acta-Ornith-Nr-2-sp.pdf}, keywords={Poland, birds, periodicals, ornithology}, }