COHERENT AND INCOHERENT EXCITON TRANSPORT, EXTENDED AND LOCALISED TRIPLET STATES IN MIXED NAPHTHALENE CRYSTALS R. Brown, Ph. Pee, F. Dupuy et Ph. Kottis J. Phys. Colloques, 46 C7 (1985) C7-79-C7-83 DOI: 10.1051/jphyscol:1985715