1. T.E. Schlesinger and R.B. James, eds., Semiconductors and Semimetals, Vol. 43 (San Diego, CA: Academic, 1995).
2. C. Canali, M. Martini, G. Ottaviani, and K.R. Zanio, Phys. Rev. B 4, 422 (1971).
3. J.W. Mayer, K.R. Zanio, M. Martini, and I.L. Fowler, IEEE Trans. NS-17, 221 (1970).
4. Z.H. Cho, M.K. Watt, M. Slapa, P.A. Tove, M. Schieber, T. Davies, W. Schnepple, P. Randtke, R. Carlston, and D. Sarid, IEEE Trans. NS-22, 229 (1975).
5. M. Roth, A. Burger, J. Nissenbaum, and M. Schieber, IEEE Trans. NS-34, 465 (1987).