BALLISTIC TRANSPORT AND DECAY OF NEAR ZONE-EDGE NON-THERMAL PHONONS IN SEMICONDUCTORS R.G. Ulbrich, V. Narayanamurti and M.A. Chin J. Phys. Colloques, 42 C6 (1981) C6-226-C6-228 DOI: 10.1051/jphyscol:1981664