FOUR-WAVE MIXING STUDIES OF IONS IN SOLIDS R.C. POWELL, A. SUCHOCKI, F.M. DURVILLE, G.D. GILLILAND, E.G. BEHRENS, G.J. QUARLES and G. BOULON J. Phys. Colloques, 48 C7 (1987) C7-417-C7-422 DOI: 10.1051/jphyscol:19877100
