@article{Hetmański:2011,
  author  = "T. Hetmański and M. Bocheński and P. Tryjanowski and P. Skórka",
  title   = "The effect of habitat and number of inhabitants on the population sizes of feral pigeons around towns in northern Poland",
  journal = "European Journal of Wildlife Research",
  volume  = "Vol. 57",
  number  = "iss. 3",
  pages   = "421--428",
  year    = "2011",
}