Refractive index dispersion law of silica aerogel T. Bellunato, M. Calvi, C. Matteuzzi, M. Musy, D.L. Perego and B. Storaci Eur. Phys. J. C, 52 3 (2007) 759-764 Published online: 26 September 2007 DOI: 10.1140/epjc/s10052-007-0431-3