@article{Or³owski:2014,
  author  = "G. Or³owski and Z. Kasprzykowski and Z. Zawada",
  title   = "Gizzard mass dynamics of nestling Rooks Corvus frugilegus",
  journal = "Avian Biology Research",
  volume  = "Vol. 7",
  number  = "no. 2",
  pages   = "117--120",
  year    = "2014",
}