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2. R. V. Budaragin and A. A. Radionov, Antenny, No. 6 (85), 25 (2004).
3. R. V. Budaragin, A. A. Radionov, and A. A. Titarenko, Fiz. Voln. Protsessov Radiotekh. Sist. 3(2), 27 (2000).
4. B. Z. Katsenelenbaum, Theory of Irregular Waveguides with Slowly Varying Parameters (Akad. Nauk SSSR, Moscow, 1961) [in Russian].
5. V. V. Shevchenko, Continuous Transitions in Open Waveguides (Nauka, Moscow, 1963; Golem, Boulder, Colo., 1971).