@article{MarwanWesselMeyerfeldtetal.2002,
  author    = {Norbert Marwan and Niels Wessel and Udo Meyerfeldt and Alexander Schirdewan and J{\"u}rgen Kurths},
  title     = {Recurrence-plot-based measures of complexity and its application to heart-rate-variability data},
  url       = {http://arxiv.org/abs/physics/0201064},
  year      = {2002},
}