1. D. S. Gnanamuthu in “Applications of Lasers in Materials Processing,” edited by E. A. Metzbower (American Society for Metals, Metals Park, Ohio, 1979 ), p. 177.
2. L. R. Hettche, E. A. Metzbower, J. D. Ayers, and P. G. Moore, Nav. Res. Rev. 33, 3 (1981).
3. J. J. Harwood, ASTM Standardization News 3, 12 (1975).
4. A. B. Gray, Metal Progress 117, 32 (1980).
5. J. D. Ayers, R. J. Schaefer and W. P. Robey, J. Metals 33, 19 (1981).