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3. D. F. Stein, W. C. Johnson andC. L. White, in ?Grain boundary structure and properties?, edited by G. A. Chadwick and D. A. Smith (Academic, London, 1976) p. 301.
4. S. W. Husain andP. C. Clapp, to be published.
5. A. Joshi andD. F. Stein,J. Inst. Metals 99 (1971) 178.