1. Mandelbrot B: Les Objets Fractals (Flammarion. Paris 1975)
2. Mandelbrot B Fractals: Form, Chance and Dimension (Freeman. San Francisco 1977)
3. Mandelbrot B The Fractal Geometry of Nature (Ibid. 1982).
4. Vannimenus J, J. Phys. (Paris) Lett. 45 (1984) 107.
5. Alexander A, Laermans C, Orbach R and Rosenberg H, Phys. Rev. B28 (1983) 4615.