1. B.B. Mandelbrot, The Fractal Geometry of Nature, Freeman, San Francisco, 1977.
2. B.J. West, Physiology, Promiscuity and Prophecy at the Millennium: A Tale of Tails, Studies of Nonlinear Phenomena in the Life Sciences, vol. 9, World Scientific, Singapore, 1998.
3. P. Meakin, Fractals, Scaling and Growth Far from Equilibrium, Cambridge Nonlinear Science Series 5, Cambridge University Press, Cambridge, 1998.
4. M. Schroeder, Fractals, Chaos, Power Laws, Freeman, New York, 1991.
5. L.F. Richardson, Proc. Roy. Soc. London A 110 (1926) 709.