1. Yu. V. Alekhin, M. P. Apin, A. A. Burtsev, et al., Ultra-Wideband Traveling Wave Lamps. Research in the Microwave, EHF, and THz Ranges. Introduction into Production, Ed. by N. A. Bushuev (Radiotekhnika, Moscow, 2015) [in Russian].
2. A. A. Burtsev, Yu. A. Grigor’ev, A. V. Danilushkin, I. A. Navrotskii, A. A. Pavlov, and K. V. Shumikhin, Tech. Phys. 63, 452 (2018). https://doi.org/10.1134/S1063784218030040
3. J. Brion, R. Wallis, A. Hartstein, and E. Burstein, Phys. Rev. Lett. 28, 1455 (1972). https://doi.org/10.1103/PhysRevLett.28.1455
4. P. Kumar and V. K. Tripathi, J. Appl. Phys. 114, 053101 (2013). https://doi.org/10.1063/1.4817091
5. R. K. Srivastav and A. Panwar, Opt. Quantum Electron. 55, 111 (2023). https://doi.org/10.1007/s11082-022-04299-y