@article{Piskorski:2009,
  author  = "J. Piskorski and P. Guzik and T. Krauze and S. Żurek",
  title   = "Cardiopulmonary resonance at 0.1 Hz demonstrated by averaged Lomb-Scargle periodogram",
  journal = "Central European Journal of Physics",
  pages   = "[7]",
  year    = "2009",
}