1. V. V. Nikol'skii and T. I. Nikol'skaya, Decomposition Approach to Electrodynamics Problems [in Russian], Nauka, Moscow (1983).
2. V. V. Nikol'skii et al., Computer-Aided Design of Microwave Devices [in Russian], V. V. Nikol'skii (ed.), Radio i Svyaz', Moscow (1982).
3. B. M. Mashkovstev, K. N. Tsibizov, and B. F. Emelin, Theory of Waveguides [in Russian], Nauka, Moscow (1966).
4. Microwave Devices Based on Magnetostatic Waves: Reviews in Electronic Engineering. Series on Microwave Electronics [in Russian], Central Scientific-Research Institute of Electronics, Moscow (1984), No. 8 (1960).
5. L. A. Vainshtein, Usp. Fiz. Nauk,118, No. 2, 340 (1976).