@article{Grygiel:1998,
  author  = "K. Grygiel and W. Leoński and P. Szlachetka",
  title   = "Validity of the cumulant method for a pulse nonlinear Kerr oscillator",
  journal = "Acta Physica Slovaca",
  volume  = "Vol. 48",
  number  = "no 3",
  pages   = "379--384",
  year    = "1998",
}