@misc{Mazgajski_Tomasz_D._Zmiany_1997,
 author={Mazgajski, Tomasz D.},
 volume={R. 54},
 editor={Institute of Nature Conservation of the Polish Academy of Sciences},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 journal={Protection of Nature},
 address={Kraków},
 howpublished={online},
 year={1997},
 language={pol},
 title={Zmiany liczebności i miejsca gniazdowania dzięcioła dużego Dendrocopos major i średniego D. medius w rezerwacie "Las Bielański" w Warszawie},
 title={Changes in the numbers and nest sites of the Great Spotted Woodpecker Dendrocopos major and Middle Spotted Woodpecker D. medius in the Las Bielański Reserve in Warsaw},
 type={Text},
 URL={http://www.rcin.org.pl/Content/121355/PDF/KR038_113527_r1997-r54_OP-Mazgajski-155-160.pdf},
 keywords={Great Spotted Woodpecker, Middle Spotted Woodpecker, Dendrocopos major, Dendrocopos medius, Las Bielański},
}