@article{ZiehmannSmithKurths1999,
  author    = {Ziehmann, Christine and Smith, L. and Kurths, J{\"u}rgen},
  title     = {The bootstrap and lyapunov exponents in deterministic chaos},
  year      = {1999},
  language  = {en}
}
@article{SmithZiehmannFraedrich1999,
  author    = {Smith, L. and Ziehmann, Christine and Fraedrich, K.},
  title     = {Uncertainty dynamics and predictability in chaotic systems},
  year      = {1999},
  language  = {en}
}