1. The lever rule is discussed in many metallurgical textbooks. See, for example,Physical Metallurgy, C. E. Birchenall, McGraw-Hill, New York, 1959.
2. L. H. Bennett, G. C. Carter, I. D. Weisman, and R. E. Watson, National Bureau of Standards, Gaithersburg, Md., unpublished research.
3. W. D. Knight: inSolid State Physics, 1956, vol. 2, F. Seitz and D. Turnbull, eds, p. 93.
4. T. J. Rowland.Progr. Mater. Sci., 1963, vol. 9, p. 1.