1. J. M. Jin and J.L. Volakis, “TM scattering by an inhomogeneously filled aperture in a thick conducting plane,” IEE Proceedings, pt. H, vol. 137, no. 3, pp. 153–159, June 1990.
2. T. B. A. Senior, K. Sarabandi, and J. R. Natzke, “Scattering by a narrow gap,” IEEE Trans. Antennas Propagat., vol. 38, no. 7, pp. 1102–1110, July 1990.
3. S. K. Jeng, “Scattering from a cavity-backed slit on a ground plane- TE case,” IEEE Trans. Antennas Propagat., pp. 1523–1529, Oct. 1990.
4. S. K. Jeng and S. T. Tzeng, “Scattering from a cavity-backed slit on a ground plane- TM case,” IEEE Trans. Antennas Propagat., vol. 39, no. 3, pp. 661–663, May 1991.
5. K. Yoshidomi, “Scattering of an electromagnetic beam wave by rectangular grooves on a perfect conductor,” Trans. Inst. Electron. Commun. Eng. Jpn., vol. E. 67, no. 8, pp. 447–448, Aug. 1984.