author  = "J. Sacha and S. Barabach and G. Statkiewicz-Barabach and K. Sacha and A. Müller and J. Piskorski and P. Barthel and G. Schmidt",
  title   = "Gender differences in the interaction between heart rate and its variability - how to use it to improve the prognostic power of heart rate variability",
  journal = "International Journal of Cardiology",
  volume  = "Vol. 171",
  number  = "no. 2",
  pages   = "42--45",
  year    = "2014",