@article{Guzik:2013,
  author  = "P. Guzik and J. Piskorski and K. Awan and T. Krauze and M. Fitzpatrick and A. Baranchuk",
  title   = "Obstructive sleep apnea and heart rate asymmetry microstructure during sleep",
  journal = "Clinical Autonomic Research",
  volume  = "Vol. 23",
  number  = "no. 2",
  pages   = "91--100",
  year    = "2013",
}