References
- Abram , R. A. and Edwards , S. F. 1972 . J. Phys. C , 5 : 1183
- Grant , A. J. and Davis , E. A. 1974 . Solid State Commun. , 15 : 563
- Hoheisel , M. , Carius , R. and Fuhs , W. 1983 . J. non-crystalline Solids , : 457 5940
- Hourd , A. C. and Spear , W. E. 1985 . Phil. Mag. B , 51 : L13
- Le Comber , P. G. and Spear , W. E. 1970 . Phys. Rev. Lett. , 25 : 509
- Marshall , J. M. , Le Comber , P. G. and Spear , W. E. 1985 . Solid St. Commun. , 54 : 11
- Spear , W. E. 1983 . J. non-crystalline Solids , 59/60 : 1
- Tiedje , T. 1984 . Semiconductors and Semimetals Edited by: Pankove , J. I. Vol. 21 , 207 New York : Academic Press . Part C, edited by,p.