@article{Kowalewska-Kudłaszyk:2009,
  author  = "A. Kowalewska-Kudłaszyk and J. Kalaga and W. Leoński",
  title   = "Long-time fidelity and chaos for a kicked nonlinear oscillator system",
  journal = "Physics Letters A",
  volume  = "Vol. 373",
  number  = "no 15",
  pages   = "1334--1340",
  year    = "2009",
}