1. N. I. Zaitsev, I. S. Kulagin, S. V. Kuzikov, M. E. Plotkin, and I. Syrachev, Microwave components for 30 GHz high-power gyroklystron, Conference Digest of the Joint 32nd Int. Conf. on Infrared and Millimetre Waves, and 15th Int. Conf. on Terahertz Electronics (Cardiff, UK, 2007), Vol. 1, pp. 369–370.
2. N. I. Zaitsev, E. V. Ilyakov, S. V. Kuzikov et al., “Pulsed high-order volume mode gyroklystron,” Radiophysics and Quantum Electronics 48 (10–11), 737–740 (2005).
3. S. N. Vlasov, L. I. Zagryadskaya, and M. I. Petelin, “Conversion of whispering gallery mode, propagating in a waveguide of circular cross-section, into paraxial wavebeam,” Radiotekhnika i Elektronika 20 (10), 2026–2030 (1975).
4. N. F. Kovalev, I. M. Orlova, and M. I. Petelin, “Wave transformation in a multi-mode waveguide with corrugated walls,” Radio Physics and Quantum Electronics 11, 449–450 (1968).
5. M. Thumm, “Modes and Mode Conversion in Microwave Devices”. Generation and application of high power microwaves. Proceedings of the Forty Eighth Scottish Universities Summer School in Physics, edited by R.A. Cairns, and A.D.R. Phelps (St Andrews, 1996), pp. 121–171.