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2. A.J. McEvily, J.B. Clark and A.P Bond: Trans. ASM, 1967, vol. 60, pp. 661-71.
3. R. Shipp: Research Report A1747, The British Non-Ferrous Metal Research Association, London, October 1969.
4. M.V. Hyatt: Reports DC-24466, DC-24467, DC-24469, DC-24470, The Boeing Company, Seattle, November 1969.
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