@article{Czechowski:2009,
author
=
"P.Czechowski",
title
=
"Nesting of tree sparrow Passer montanus in the nest of Barn Swallow Hirundo rustica",
journal
=
"International Studies of Sparrows",
volume
=
"Vol. 32",
pages
=
"35--37",
year
=
"2007",
}