1. Klauk, H., Ed., Organic Electronics, Berlin: Wiley-VCH, 2006, p. 428.
2. Brabec, C., Scherf, U., and Dyakonov, V., Eds., Organic Photovoltaics, Berlin: Wiley-VCH, 2008, p 575.
3. Bernards, D.A., Owens, R.M., and Malliaras, G.G., Eds., Organic Semiconductors in Sensor Applications, Berlin: Springer, 2008, p. 290.
4. Borsenberger, P.M. and Weiss, D.S., Organic Photoreceptors for Xerography, Boca Raton: CRC Press, 1998, p. 799.
5. Shklovskii, B. and Efros, A., Electronic Properties of Doped Semiconductors, Berlin: Springer, 1984, p. 456.