1. C. Canus, J. Lévy Véhel and C. Tricot (1998) In proceedings of Fractals 98,
Malta, October 1998.
2. M.-O. Coppens (1997): Fractals in Engineering. Eds. J. Levy-Vehel, E. Lutton and C. Tricot (Springer, Berlin), 336.
3. M.-O. Coppens and B.B. Mandelbrot (1999). Submitted for publication
4. C.J.G. Evertsz and B.B. Mandelbrot (1992). J. Phys. A: Math. Gen. 25, 1781.
5. C.J.G. Evertsz and B.B. Mandelbrot (1992): Chaos and Fractals. Eds. H.-O. Peitgen, H. Jürgens and D. Saupe (Springer, New York), 921.