@article{Kalaga:2006,
  author  = "J. Kalaga and A. Kowalewska-Kudłaszyk and W. Leoński",
  title   = "Quantum chaos systems and fidelity",
  journal = "Acta Physica Hungarica B : Quantum Electronics",
  volume  = "Vol. 26",
  number  = "no 3-4",
  pages   = "237--241",
  year    = "2006",
}