References
- Anderson , P. W. 1958 . Phys. Rev. , 109 : 1492
- Blandin , A. 1961 . J. Phys. , 22 : 508
- Goldberger , M. L. and Watson , K. M. 1964 . Collision Theory , New York : Wiley .
- Greenwood , D. A. 1958 . Proc. phys. Soc. , 71 : 585
- Liciardello , D. and Thouless , D. J. 1975 . J. Phys. C , 8 : 4157
- Lukes , T. 1975 . Phil. Mag. , 32 : 1033
- Mott , N. F. and Davis , E. A. 1971 . Electronic Processes in Non-crystalline Materials , Oxford : Clarendon Press .
- Wigner , E. P. 1955 . Phys. Rev. , 98 : 145