OPTICAL DEPHASING OF Pr3+ IONS BY NONEQUILIBRIUM PHONONS IN LaF3 AND YAlO3 R.M. Macfarlane et R.S. Meltzer J. Phys. Colloques, 46 C7 (1985) C7-253-C7-257 DOI: 10.1051/jphyscol:1985746