@article{Jerzak:2009,
author
=
"L.Jerzak",
title
=
"Magpie Pica pica nest sites in urban habitats in Poland",
journal
=
"Acta Ornithologica",
volume
=
"Vol. 32",
number
=
"no 1",
pages
=
"69--76",
year
=
"1997",
}