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2. H. Conrad:The Relation Between the Structure and Mechanical Properties of Metals, p. 476, HMSO, 1963.
3. D. F. Stein and J. R. Low, Jr.:Acta Met., 1966, vol. 14, p. 1183.
4. Y. Nakada and A. S. Keh:Acta Met., 1968, vol. 16, p. 903.
5. R. L. Fleischer:The Strengthening of Metals, Donald Peckner, ed., p. 93, Reinhold Publishing Corp., New York, 1964.