1. B.B. Mandelbrot,The Fractal Geometry of Nature (Freeman, San Francisco, CA, 1982).
2. P. Pfeifer and D. Avnir, J. Chem. Phys. 79 (1983) 3558;
3. D. Avnir, D. Farin and P. Pfeifer, J. Chem. Phys. 79 (1983) 3566.
4. D. Avnir and P. Pfeifer, Nouv. J. Chim. 7 (1983) 71;
5. D. Farin, A. Volpert and D. Avnir, J. Am. Chem. Soc. 107 (1985) 3668;