1. K.Sakamoto, M.Tsuneoka, A.Kasugai, K.Takahashi, S.Maebara, T.Imai, T.Kariya, Y.Okazaki, K.Hayashi, Y.Mitsunaka, and Y.Hirata, Digest of 19th Int. Conf. on IR and MM Waves, Sendai, Japan, pp.63–64 (October 1994).
2. G.S.Nusinovich, R.E.Erm, Elektronnaya Tekhnika, Ser. 1 Elektronika SVCh., 55, 1972.
3. A.V. Gaponov, V.A. Flyagin, A.L. Gol'denberg, G.S. Nusinovich, Sh.E. Tsimring, V.G. Usov, and S.N. Vlasov, Int.J.Electronics 51, 277, 1981.
4. V.K. Yulpatov, In:Gyrotrons, Issue 1 (Gorky: Institute of Applied Physics, 1981, Ed. A.V. Gaponov-Grekhov), 26.
5. V.L. Bratman, N.S. Ginzburg, A.V. Savilov, In:Relativistic High-Frequency Electronics, Issue 7 (Nizhny Novgorod: Institute of Applied Physics, 1992, Ed. A.V. Gaponov-Grekhov), 22.