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References:

•  R.M. May & ??  {recently on measel epidemics}
•  M. Casdagli,  Physica D  vol.35 (1989) p335
•  Crutchfield & McNamara,  Complex systems  vol.1 (1987) p417
•  Farmer & Sidorowich,  Phys. Rev. Lett.  (1987) p845