@article{IvanovNuenesAmaralGoldbergeretal.2001,
  author    = {Plamen Ch. Ivanov and Lu{\´i}s A. Nuenes Amaral and Ary L. Goldberger and Shlomo Havlin and Michael Rosenblum and H. Eugene Stanley and Zbigniew R. Struzik},
  title     = {From 1/f noise to multifractal cascades in heartbeat dynamics},
  year      = {2001},
}