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2. D. Dulieu: Discussion to paper by V. F. Zackay, E. R. Parker, and W. E. Wood;Proc. Third Intl. Conf. on the Strength of Metals and Alloys, vol. 2, p. 383, Institute of Metals/Iron and Steel Institute, Cambridge, England, Aug. 1973.
3. W. E. Wood, E. R. Parker, and V. F. Zackay: Rept. No. LBL-1474, Lawrence Berkeley Laboratory, University of California, Berkeley, Calif. 94720, May, 1973.
4. A. A. Anctil and E. B. Kula: unpublished research, Army Materials and Me- chanics Research Center, Watertown, Mass., 1975.
5. Annual Book of ASTM Standards (American Society for Testing and Materials), ASTM Standards E399-74, Philadelphia, 1974.