@article{WittFeudelGebogietal.1998,
  author    = {Annette Witt and Fred Feudel and C. Gebogi and J{\"u}rgen Kurths and Robert Braun},
  title     = {Tracer dynamics in a flow of driven vortices},
  journal   = {Preprint NLD},
  volume    = {51},
  year      = {1998},
}