1. V. P. Shestopalov, L. N. Litvinenko, S. A. Masalov, and V. G. Sologub, Diffraction of Waves by Gratings [in Russian], (Izd. KhGU, Kharkov, 1973), 287 pp.
2. M. Ando and K. Takei, IEEE Trans. Antennas Propag. AP-35, 367 (1987).
3. V. P. Androsov and I. K. Kuz’michev, IRÉ AN Ukr. SSR Preprint No. 355 [in Russian] (Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkov, 1987), 14 pp.
4. S. S. H. Naqvi and N. C. Gallagher, J. Opt. Soc. Am. A 7, 1723 (1990).
5. B. Gimeno, J. L. Cruz, E. A. Navarro, and V. Such, J. Electromagn. Waves Appl. 7, 1201 (1993).