@article{SauerGrebogiYorke1997,
  author    = {Sauer, T. and Grebogi, Celso and Yorke, J. A.},
  title     = {How long do numerical chaotic solutions remain valid?},
  year      = {1997},
  language  = {en}
}
@article{PoonGrebogiFeudeletal.1998,
  author    = {Poon, L. and Grebogi, Celso and Feudel, Ulrike and Yorke, J. A.},
  title     = {Dynamical properties of a simple mechanical system with a large number of coexisting periodic attractors},
  year      = {1998},
  language  = {en}
}