1. B.D. Patterson, Rev. Mod. Phys. 60 (1988) 69.
2. R.F. Kiefl and T.L. Estle, in:Hydrogen in Semiconductors, Semiconductors and Semimetals, Vol. 34, eds. J.I. Pankove and N.M. Johnson, Ser. eds. R.K. Willardson and A.C. Beer (Academic Press, New York, 1991) p. 547.
3. S.F.J. Cox, Phil. Trans. Roy. Soc. A 350 (1995) 171.
4. T.L. Estle, Hyp. Int. 64 (1990) 525.
5. T.L. Estle, R.F. Kiefl, J.W. Schneider and C. Schwab, in:Impurities, Defects and Diffusion in Semiconductors: Bulk and Layered Structures, MRS Symposium Proceedings, Vol. 163, eds. D.J. Wolford, J. Bernholc and E.E. Haller (1990) p. 407.