EXCITON MIGRATION AND LOCALISATION IN PURE INORGANIC SOLIDS J.R.G. Thorne, R.G. Denning, T.J. Barker et D. I. Grimley J. Phys. Colloques, 46 C7 (1985) C7-125-C7-128 DOI: 10.1051/jphyscol:1985724