@misc{Józefik_Mieczysław_(1930–_)_Studies_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={Studies on the squacco heron, Ardeola ralloides (Scop.). 2. Secular changes in the numbers and distribution in the palearctic range},
 type={Text},
 URL={http://rcin.org.pl/miiz/Content/13566/PDF/WA058_29799_P257-T11_Acta-Ornith-Nr-7.pdf},
 keywords={squacco heron, ecology, counting, Palearctic Region, breeding sites, range changes 19th-20th century, herons, birds, Ardeola ralloides, Ardeidae, Aves},
}