@article{Piskorski:2011,
  author  = "J. Piskorski and P. Guzik",
  title   = "The structure of heart rate asymmetry: deceleration and acceleration runs",
  journal = "Physiological Measurement",
  volume  = "Vol. 32",
  number  = "no 8",
  pages   = "1011--1023",
  year    = "2011",
}