1. B. P. Varaksin, A. S. Titkov, V. I. Silantev, and N. A. Shevchenko, Poverkhnost, No. 11: 125 (1991) (in Russian).
2. Review on Thermionic Energy Converters
3. Tugoplavkie Materialy v Mashinostroenii. Spravochnik [Refractory Materials in Mechanical Engineering. Handbook] (Moscow: Mashinostroenie: 1967) (in Russian).
4. A. R. Shulman and S. A. Fridrihov, Vtorichno-Emissionnye Metody Issledovaniya Tverdogo Tela [Secondary Emission Methods for Solids Study] (Moscow: Nauka: 1977) (in Russian).
5. M. A. Vasil'ev, Struktura i Dinamika Poverkhnosti Perekhodnykh Metallov [Transition Metals Structure and Surface Dynamics] (Kyiv: Naukova Dumka: 1988) (in Russian).