1. N. S.Ginzburg, N.Yu. Peskov, R.M. Rosental, and A. S. Sergeev, Tech. Phys. Lett., 35, No. 2, 190 (2009).
2. N. S.Ginzburg, N.Yu.Peskov, A. S. Sergeev, et al., Radiophys. Quantum Electron., 44, Nos. 5–6, 494 (2001).
3. N. F.Kovalev and M. I.Petelin, Relativistic High-Frequency Electronics [in Russian], No. 2, Inst. Appl. Phys. RAS, Nizhny Novgorod, 62 (1981).
4. N. S.Ginzburg, N. F. Kovalev, and N.Yu. Rusov, Opt. Comm., 46, Nos. 5–6, 300 (1983).
5. N. S.Ginzburg, N. F. Kovalev, and M. I.Petelin, Relativistic High-Frequency Electronics [in Russian], No. 6, Inst. Appl. Phys. RAS, Nizhny Novgorod, 7 (1990).