1. Lenel, F. V., H. H. Hausner, E. Hayashi, and G. S. Ansell, Powder Met.
8: 25 (1961).
2. Lenel, F. V., H. H. Hausner, O. V. Roman, and G. S. Ansell, Trans. Met. Soc. AIME
227: 640 (1963).
3. Lenel, F. V., H. H. Hausner, I. A. Shanshoury, J. G. Early, and G. S. Ansell, Powder Met.
10: 190 (1962).
4. Herring, G, in: W. E. Kingston (ed.), The Physics of Powder Metallurgy, McGraw-Hill (New York), 1951, p. 143.
5. Nabarro, F. R. N., Report on a Conference on the Strength of Materials, The Physical Society (London), 1948, p. 75.