@article{Or³owski:2011,
  author  = "G. Or³owski and J. Karg",
  title   = "Diet of nestling Barn Swallows Hirundo rustica in rural areas of Poland",
  journal = "Central European Journal of Biology",
  volume  = "Vol. 6",
  number  = "no 6",
  pages   = "1023--1035",
  year    = "2011",
}