@misc{_Acta_1987, volume={23}, editor={Polska Akademia Nauk. Instytut Zoologii}, number={1}, journal={Acta Ornithologica}, address={Warszawa}, howpublished={online}, year={1987}, publisher={PaƄstwowe Wydawnictwo Naukowe}, language={pol}, language={eng}, language={rus}, type={Text}, title={Acta Ornithologica, vol. 23 no 1 (1987)}, keywords={ornithology, birds, Poland, periodicals}, }