author  = "S. Żurek and J. Piskorski and P. Guzik and M. Kośmider and M. Lewandowski and P. Castiglioni",
  title       = "Day-to-night variations of RR intervals complexity observed in 24-h ECG Holter R",
  booktitle   = "8th Conference of the European Study Group on Cardiovascular Oscillations - ESGCO 2014; ISBN: 9781479939695",
  address     = "Trento, Włochy",
  publisher   = "New York, IEEE",
  pages       = "203--204",
  year        = "2014",