@article{RosenblumPengIvanovetal.1998,
  author    = {Rosenblum, Michael and Peng, C. K. and Ivanov, Plamen Ch. and Mietus, J. and Havlin, Shlomo and Stanley, H. Eugene and Goldberger, Ary L.},
  title     = {Scaling and universality in heart rate variability distributions},
  year      = {1998},
  language  = {en}
}
@article{AmaralGoldbergerHavlinetal.1999,
  author    = {Amaral, Luis A. Nunes and Goldberger, Ary L. and Havlin, Shlomo and Rosenblum, Michael and Struzik, Zbigniew R. and Stanley, H. Eugene and Ivanov, Plamen Ch.},
  title     = {Multifractality in human heartbeat dynamics},
  year      = {1999},
  language  = {en}
}
@article{IvanovNuenesAmaralGoldbergeretal.2001,
  author    = {Ivanov, Plamen Ch. and Nuenes Amaral, Lu{\´i}s A. and Goldberger, Ary L. and Havlin, Shlomo and Rosenblum, Michael and Stanley, H. Eugene and Struzik, Zbigniew R.},
  title     = {From 1/f noise to multifractal cascades in heartbeat dynamics},
  issn      = {1054-1500},
  year      = {2001},
  language  = {en}
}