1. J. Levin and F. Gelhaus, in Direct Conversion of Heat Energy to Electrical Energy and Fuel Elements (Akad. Nauk SSSR, Moscow, 1968), Vol. 4, p. 109.
2. B. M. Zykov, A. M. Sabel’nikov, V. K. Tskhakaya, et al., Poverkhnost, No. 4, 65 (1987).
3. B. M. Zykov and Yu. I. Nardaya, Zh. Tekh. Fiz. 65(4), 150 (1995) [Tech. Phys. 40, 372 (1995)].
4. Methods of Surface Analysis, Ed. by A. W. Czanderna (Elsevier, New York, 1975; Mir, Moscow, 1979).
5. B. M. Zykov, V. K. Tskhakaya, and V. I. Yarygin, USSR Inventor’s Certificate No. 1062803, Otkrytiya, Izobret., No. 47, 236 (1983).