The origin of the redshift in Brillouin spectra of silica films containing tin nanoparticles A. Li Bassi, C. E. Bottani, B. K. Tanner, A. Stella, P. Tognini, P. Cheyssac and R. Kofman Eur. Phys. J. B, 18 1 (2000) 31-38 Published online: 15 November 2000 DOI: 10.1007/s100510070074