Acoustic phenomena in filled porous glasses by time-resolved spectroscopy R. Cucini, A. Taschin, C. Ziparo, P. Bartolini and R. Torre Eur. Phys. J. Special Topics, 141 (2007) 133-136 Published online: 29 March 2007 DOI: 10.1140/epjst/e2007-00030-2