@article{Piskorski:2012,
  author  = "J. Piskorski and P. Guzik",
  title   = "Compensatory properties of heart rate asymmetry",
  journal = "Journal of Electrocardiology",
  volume  = "Vol. 45",
  number  = "no 3",
  pages   = "220--224",
  year    = "2012",
}