1. L. Lewin, Advanced Theory of Waveguides, Iliffe, London (1951).
2. V. P. Malanchenko and G. M. Kizeeva, Radiotekh. Elektron.,9, No. 1, 1 (1972).
3. A. A. Brandt, Investigation of Dielectrics at Microwave Frequencies [in Russian], Fizmatgiz, Moscow (1963).
4. B. M. Mashkovtsev, K. N. Tsibizov, and B. F. Emelin, Waveguide Theory [in Russian], Nauka, Moscow-Leningrad (1966).
5. Yu. B. Korchemkin, Abstract No. 3-5913 [in Russian], NIIÉIR (dep. Aug. 21, 1978).