1. N. Kh. Ibrayev and V. A. Latonin, J. Luminesc. 87–89, 760 (2000).
2. N. Kh. Ibraev and V. A. Latonin, Fiz. Tverd. Tela 41(4), 736 (1999).
3. M. Pope and C. E. Swenberg, Electronic Processes in Organic Crystals (Clarendon Press, Oxford, 1982; Mir, Moscow, 1985), Vol. 1.
4. E. I. Newhouse and R. Kopelman, Chem. Phys. Lett. 143, 106 (1988).
5. N. Kh. Ibraev, Opt. Spektrosk. 93(2), 258 (2002) [Opt. Spectrosc. 93 (2), 242 (2002)].