1. See, for example, Chan, F. T., Lieber, M, Foster, G. and Williamson, Jr., W. : Advances in Electronics and Electron Physics, edited by Marton, L. and Marton, C., Vol. 49, p. 133, New York : Academic 1979.
2. Golden, J. E. and McGuire, J. H.: Phys. Rev. Lett. 32,1218 (1974).
3. Golden, J. E. and McGuire, J. H. : Phys. Rev. A 12, 80 (1975).
4. Golden, J. E. and McGuire, J. H. : Phys. Rev. A 15, 499 (1977).
5. McGuire, J. H. : Phys. Rev. A 26, 143 (1982).