1. Abe, K., Hattori, K., Okamoto, H., and Hamakawa, Y., Philos. Mag., (1988) in press.
2. Abeles, B., Wronski, C.R., Goldstein, Y., and Cody, G.D., (1982), Solid State Comm. 41, 250.
3. Adler, D., (1984), in Semiconductors and Semimetals, Vol. 21: Hydrogenated Amorphous Silicon, Part A, J.I. Pankove, ed., Academic Press Inc., Chap. 14, pp. 291–316.
4. Adler, D., (1983), Solar Cells, 9, 133.
5. Allan, D.C., and Joannopoulos, J.D., (1984) in Topics in Applied Physics, Vol. 56 — The Physics of Hydrogenated Amorphous Silicon II, J.D. Joannopoulos and G. Lucovsky, eds., Springer-Verlag, Berlin Chap. 2, pp. 5–55.