1. Classical Electrodynamics;Jackson,1962
2. Handbook of Optical Constants of Solids,1985
3. Handbook of Optical Constants of Solids, Vol. II,1991
4. Semiconductors and Semimetals, Vol. 21, Hydmgenated Amorphous Silicon, PartB;Cody,1984
5. Urbach's rule derived from thermal fluctuations in the band-gap energy