1. V. S. Fomenko, Emission Properties of Materials (Naukova Dumka, Kiev, 1981) [in Russian].
2. L. N. Sidorov, M. V. Korobov, and L. V. Zhuravleva, Mass-Spectrum Thermodynamic Studies (Mosk. Gos. Univ., Moscow, 1985) [in Russian].
3. L. D. Landau and E. M. Lifshitz, Course of Theoretical Physics, Vol. 8: Electrodynamics of Continuous Media (Pergamon, New York, 1984; Fizmatlit, Moscow, 2005).
4. M. A. Leontovich, Introduction to Thermodynamics. Statistical Physics (Nauka, Moscow, 1983) [in Russian].
5. V. V. Vladimirov, Physical Electronics, Part 1: Thermionic Emission (Fizmatlit, Moscow, 2005) [in Russian].