1. Lukonin, S.G., Filippenkova, L.S., and Kurlyan-dskii, I.A., Release of argon from welds made by arc welding in argon and helium and laser welding in nitrogen, Elektron. Tekh., Ser. Elektron. SVCh, 1981, no. 8 (332), pp. 49–51.
2. Kudintseva, G.A., Mel’nikova, A.I., Morozov, A.V., and Nikonov, B., Thermoelectronic cathodes, Energiya, 1966, pp. 218–259.
3. Gilmour, A.S., Jr., Principles of Traveling Wave Tubes, USA: Artech House, 1994.
4. Ye Hua, Hong Wan, Xingyu Chen, Bin Chen, Ping Wu, and Shuxin Bai, Influence of surface microstructures on explosive electron emission properties for graphite cathodes, IEEE Trans. Plasma Sci., 2017, vol. 45, no. 6, pp. 959–968. https://doi.org/10.1109/TPS.2017.2703139
5. Filip, V., Filip, L.D., and Hei, W., Review on peculiar issues of field emission in vacuum nanoelectronic devices, Solid-State Electron., 2017, vol. 138, pp. 3–15. https://doi.org/10.1016/j.sse.2017.09.010