1. A. N. Nesmeyanov, Vapor Pressure of the Elements, Academic Press, New York (1963).
2. D. L. Schreder and J. F. Elliot, Trans. Metall. Soc. AIME,236, 1091 (1966).
3. A. C. G. Mitchell and M. W. Zemansky, Resonance Radiation and Excited Atoms, Macmillan Company, New York (1934).
4. E. J. Rapperport and I. P. Pemsler, Trans. Metall.Soc. AIME,242, 151 (1968).
5. A. M. Nemets and G. I. Nikolaev, Zh. Prikl. Spektrosk.,18, 571 (1973).