1. W. Draper J. Metals,34 (6) (1982)24.
2. K. Mohammed Jasim, R. D. Rawlings andD. R. F. West,J. Mater. Sci. 25(1990)4943.
3. W. M. Steen, unpublished work, Imperial College, University of London (1986).
4. T. C. Wells,Surfacing J. 9(1978)2.
5. E. M. Breinan, B. H. Kear, L. E. Greanwald andC. M. Banas, in ?Lasers in modern industry?, edited by J. F. Ready, (Society of Manufacturing Engineers, MI USA, 1979) p. 147.