1. S.J. Gregg, K.S.W. Sing:Adsorption, surface area and porosity, 2nd Ed. Academic Press, New York 1982.
2. P. Pfeifer, D.J. Avnir:Chem. Phys.,79, 3558 and 3566 (1983).
3. D. Avnir, P. Pfeifer:Nouv. J. Chim.,7, 71 (1983).
4. D. Avnir, D. Farin, P. Pfeifer:J. Colloid and Interface Sci.,103, 112 (1985).
5. Fractals in Physics (Eds. L. Pietronero, E. Tosatti). North-Holland, Amsterdam 1986.