@misc{Józefik_Mieczysław_(1930–_)_Caspian_1969,
 author={Józefik, Mieczysław (1930– )},
 editor={Polska Akademia Nauk. Instytut Zoologiczny},
 copyright={Rights Reserved - Free Access},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1969},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 language={pol},
 language={rus},
 title={Caspian tern, Hydroprogne caspia Pall. in Poland - the biology of migration period},
 type={Text},
 URL={http://rcin.org.pl/Content/13570/PDF/WA058_29813_P257-T11_Acta-Ornith-Nr-11.pdf},
 keywords={Caspian tern, bird migration, terns, birds, 1800-1966, Hydroprogne caspia, Sterna caspia, Sternidae, Aves},
}