1. A. Kelly and R. B. Nicholson:Progr. Mater. Sci., 1963, vol. 10, p. 15.
2. J. G. Kaufman and H. Y. Hunsicker: ASTM, STP 381, p. 290,1965.
3. R. Develay:Metals and Materials, vol. 6, p. 404, 1972.
4. H. Y. Hunsicker:Aluminium, K. van Horn, ed., vol. 1, p. 148,ASM, 1967.
5. P. J. Guest:M.Sc. Thesis, Report No. UCRL 27872, University of California, 1967.