1. D. H. Seib, L. W. Aukerman: Advances in Electronics and Electron Physics
34, ed. by L. Marton (Academic Press, New York 1973) pp. 95–221
2. J.O. Dimmock: J. Electron. Mater. 1, 255 (1972); see also
3. R. B. Emmons, S. R. Hawkins, K. F. Cuff: Optical Engineering 14, 21 (1975)
4. H. Levinstein, J. Mudar: Proc. IEEE 63, 6 (1975)
5. T. C. Harman, I. Melngailis: Applied Solid State Science
4, ed. by R. Wolfe (Academic Press, New York 1974) pp. 1–94; see also