1. J. Bunce and R. Evans, in: The Metallurgy of Beryllium, Chapman and Hall, London (1963), p. 246.
2. G. Meyer and J. Denny, in: Beryllium Technology, Gordon and Breach, New York (1966), p. 589.
3. V. E. Ivanov et al., Fiz. Metallov i Metallovedenie,31, 1286 (1971).
4. V. E. Ivanov et al., ibid, p. 1281, (.
5. L. Aronin, Conf. Intern. sur la Metallurgie du Beryllium, Press Univ. de France, Grenoble (1965), p. 309.