1. Internal Report 4/2001, School of Mathematical and Statistical Sciences, University of Natal, South Africa.
2. Applications of chaos to physiology and medicine;Goldberger,1992
3. From Clocks to Chaos. The Rhythms of Life;Glass,1988
4. Chaotic chaos;Hill;Math. Intelligencer,2000
5. An Introduction to Chaotic Dynamical Systems;Devaney,1989