1. G. D. Watkins, in: Radiation Damage in Semiconductors P. Baruch ed. (Dunod, Paris 1964) p. 97.
2. Inst. Phys. Conf. Ser.;G. D. Watkins,1975
3. K. L. Brower, Phys. Rev. B 1, 1908 (1970).
4. R. E. McKeighen and J. S. Koehler, Phys. Rev. B 4, 462 (1971).
5. P. S. Gwozdz and J. S. Koehler, Bull. Am. Phys. Soc. 17, 307 (1972).