1. Wilson, W.W., (1983) IEEE Trans. Microwave Theory and Techniques, Vol. MTT-31, p. 873.
2. Waksberg, A. and Drèze, C., (1984), Int. J. Infrared and MM Waves, (This issue).
3. Lebrun, G., Genois, J., Geoffrion, J. and Gregory, B.C. (1982), Rapport INRS-E 186, INRS-énergie, Varennes (Québec).
4. Fetterman, H.R., Tannenwald, P.E., Clifton, B.J., Parker, C.D. and Fitzgerald, W.D., Erickson, N.R., (1978), Appl. Phys. Lett., Vol. 33, p. 151.
5. Millimetre Wave Technology Limited, Ireland.