1. B. Lax and K. J. Button, Physics of Solids in Intense Magnetic Fields, E.D. Haidemenakis (ed.), p. 145 ( Plenum, New York, 1969 ).
2. B. Lax, J. Mag. & Mag. Matter 11, 1 (1979); P. Phelan, A. Calawa, R. H. Rediker, R. J. Keyes, and B. Lax, Appl. Phys. Lett. 3, 143 (1963).
3. T.H. Maiman, Nature 187, 493 (1960).
4. A. Yariv, Introduction to Optical Electronics, Chap. 15 ( Holt, Rinehart and Winston, New York, 1985 ).
5. 1. C. Weisbuck, Proc. of 22nd International Conference on Physics of Semiconductors, E. J. Lockwood (ed.), (World Scientific, Singapore, 1955)