E. Rat et al.: "Observation of the Crossover to Strong Scattering of Acoustic Phonons in Densified Silica"Physical Review Letters. 83. 1355-1358 (1999)
E. Rat et al.: "Observation of the Crossover to Strong Scattering of Acoustic Phonons in Densified Silica"Physical Review Letters. 83. 1355-1358 (1999)