@misc{_Acta_1991,
 volume={26},
 editor={Polska Akademia Nauk. Instytut Zoologii},
 number={2},
 copyright={Rights Reserved - Free Access},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1991},
 publisher={Instytut Zoologii PAN},
 language={eng},
 language={pol},
 language={rus},
 type={Text},
 title={Acta Ornithologica ; vol. 26, no 2 - Spis treści},
 URL={http://www.rcin.org.pl/Content/42405/PDF/WA058_59191_P257-T26_Acta-Ornith-Nr-2-sp.pdf},
 keywords={Poland, birds, periodicals, ornithology},
}