@article{RosenblumPengIvanovetal.1998,
  author    = {Michael Rosenblum and C. K. Peng and Plamen Ch. Ivanov and J. Mietus and Shlomo Havlin and H. Eugene Stanley and Ary L. Goldberger},
  title     = {Scaling and universality in heart rate variability distributions},
  year      = {1998},
}