@article{Guzik:2005,
  author  = "P. Guzik and J. Piskorski",
  title   = "Decomposition of the comet-like Poincare plots of RR intervals",
  journal = "Folia Cardiologica",
  volume  = "T. 12",
  number  = "supl. D",
  pages   = "432--435",
  year    = "2005",
  note    = "www.fc.viamedica.pl",
}