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2. 2) G. S. Smith: Progress in Metal Physics, 1 (1949), 163.
3. 3) A. H. Geisler: Phase Transformations in Solids, Wiley (New York) (1951).
4. 4) H. K. Hardy and T. J. Heal: Progress in Metal Physics, 5 (1954), 143.
5. 5) J. B. Newkirk: Precipitation from Solid Solution, A.S.M. (Cleveland, Ohio) (1959).