@article{Czechowski:2009,
author
=
"P.Czechowski and L.Jerzak",
title
=
"The roosting behaviour of the magpie Pica pica in an urban environment",
journal
=
"Vogelwarte",
volume
=
"Vol. 42",
number
=
"no 1-2",
pages
=
"14--15 [abstr.]",
year
=
"2003",
}