@unpublished{BraunFeudelGuzdar2007,
  author  = {Robert Braun and Fred Feudel and Parvez Guzdar},
  title   = {The route to chaos for a two-dimensional externally driven flow},
  institution = {Institut f{\"u}r Physik und Astronomie},
  series    = {NLD Preprints},
  number    = {46},
  year    = {2007},
}