LIGHT SCATTERING INVESTIGATION OF THE FRACTAL BEHAVIOUR OF SILICA GELS P. LOURDIN, J. APPELL, J. PELOUS et T. WOIGNIERJ. Phys. Colloques, 50 C4 (1989) C4-197-C4-201DOI: https://doi.org/10.1051/jphyscol:1989432