@misc{_Acta_1998, editor={Polska Akademia Nauk. Muzeum i Instytut Zoologii}, journal={Acta Ornithologica}, address={Warszawa}, howpublished={online}, year={1998}, publisher={Muzeum i Instytut Zoologii PAN}, language={pol}, language={eng}, language={rus}, type={Text}, title={Acta Ornithologica, vol. 33 no 1-2 (1998)}, keywords={ornithology, birds, Poland, periodicals}, }