@InCollection{Czechowski:2005,
author
=
"P.Czechowski and L.Jerzak",
title
=
"Magpie Pica pica communal roosting in an urban environment (Zielona Góra, W Poland)",
pages
=
"287--298",
year
=
"2005",
booktitle
=
"Ptaki krukowate Polski ISBN: 8389290928",
editor
=
"red. L. Jerzak, B. P. Kavanagh, P. Tryjanowski",
publisher
=
"Bogucki Wydaw. Naukowe",
address
=
"Poznań",
}