1. Bannister, P.R. 1974,IEEE Trans. Commun.,4, 468.
2. Bannister, P.R., F.J. Williams, J.R. Katan, and R.F. Ingram 1973a, NUSC Tech. Rpt 4617, 17 October 1973.
3. Bannister, P.R., E. A. Wolkoff, J.R. Katan, and F. J. Williams 1973b,Radio Sci.,8, 623.
4. Bannister, P.R., F. J. Williams, J. R. Katan, and R. F. Ingram 1974a,IEEE Trans. Commun.,4 474
5. Bannister, P.R., and F.J. Williams 1974b, NUSC Tech. Rpt. 4719, (to be published)