EXCITON-POLARITON AND CHARGE TRANSFER STATES IN POLYMORPHS OF QUASI-METALLIC CRYSTALS OF DYES M. Tristani-Kendra, J. Delaney et C.J. Eckhardt J. Phys. Colloques, 46 C7 (1985) C7-425-C7-428 DOI: 10.1051/jphyscol:1985775