1. M. Pope and C.E. Swenberg, “Electronic Processes in Organic Crystals”, Oxford University Press, New York (1982), and references therein.
2. H. Haken and G. Strobl, in “The Triplet State”, A.B. Zahlan ed., Cambridge University Press, Cambridge (1967).
3. R. Silbey, Ann. Rev. Phys. Chem. 27, 203 (1976).
4. V.M. Kenkre, in “Exciton Dynamics in Molecular Crystals and Aggregates” G. Höhler ed., Springer Verlag, Berlin (1982).
5. P.Reineker, in “Exciton Dynamics in Molecular Crystals and Aggregates”, G. Höhler ed., Springer Verlag, Berlin (1982).