@unpublished{GuastiEngbertKrampeetal.2007,
  author  = {Giovanna Guasti and Ralf Engbert and Ralf T. Krampe and J{\"u}rgen Kurths},
  title   = {Phase transitions, complexity, and stationarity in the production of polyrhythms},
  institution = {Institut f{\"u}r Physik und Astronomie},
  series    = {NLD Preprints},
  number    = {57},
  year    = {2007},
}