1. C. W. Bert,J. Mater. Sci. Lett. 1 (1982) 247.
2. ASTM STP 674;C. Zweben,1979
3. J. E. Schoutens, unpublished data.
4. S. Timoshenko, ?Strength of Materials?, Part I ? Elementary Theory and Problems. 3rd Edn (Van Nostrand, New York, 1955) p. 218.
5. J. E. Schoutens,J. Mater. Sci. 19 (1984) 957.