1. M. Pope and C. E. Swenberg, Electronic Processes in Organic Crystals (Clarendon, Oxford, 1982; Mir, Moscow, 1985).
2. H. Bässler, Phys. Status Solidi B 175, 15 (1993).
3. I. P. Zvyagin, Kinetic Phenomena in Disordered Semiconductors (Mosk. Gos. Univ., Moscow, 1984) [in Russian].
4. A. P. Tyutnev, V. S. Saenko, E. D. Pozhidaev, and N. S. Kostyukov, Dielectric Properties of Polymers in Ionizing Radiation Fields (Nauka, Moscow, 2005) [in Russian].
5. S. V. Novikov, D. H. Dunlap, V. M. Kenkre, et al., Phys. Rev. Lett. 81, 4472 (1998).