1. Mott, N.F. (1987): Conduction in Non-Crystalline Materials, Oxford Science Publishing: Chap. 3.
2. Economou, E.N., Soukoulis, C.M., Cohen, M.H., John, S. (1987): Disordered Semiconductors, ed. by Kastner, M.A. et al., Plenum Press: pp.681–701.
3. Okamoto, H. (1999): Amorphous Silicon, ed. by Tanaka, K., John Willey ttt Sons: Chap. 4.
4. Okamoto, H., Hattori, K. (1996): Phenomenological Scaling of Optical Absorption in Amorphous Semiconductors, J. Non-Cryst. Solids 198ttt200: pp. 124–127.
5. Cody, G.D. (1984): Hydrogenated Amorphous Silicon, Semiconductors and Semimetals vol. 21B, ed. by Pankove J.I., Academic Press: Chap. 2.