1. R. Reisfeld, Fractal behaviour of porous glasses. NATO Int’l. School on Atomic and Molecular Spectroscopy, 8th Course, Disordered Solids: Structures and Processes, Erice, Italy, June 15–29, 1987, being published by Plenum Press, Ed. B. DiBartolo.
2. J.D. Mackenzie, J. Non-Cryst. Solids 100, 162 (1988).
3. V.R. Kaufman, D. Avnir, D. Pines-Rojanski and D. Huppert, J. Non-Cryst. Solids 99, 379 (1988).
4. K.C. Chen, T. Tsuchiya and J.D. Mackenzie, J. Non-Cryst. Solids 81, 227 (19860.
5. C.J. Brinker and G.W. Scherer, J. Non-Cryst. Solids, 70, 301 (1985).