1. CO2 Laser Welding of Aero-Engine Materials, Rep. 3335/3/73;Adams,1973
2. Alexander, J., 1981, unpublished work, University of Illinois, Urbana, USA.
3. Alexander, J. and Steen, W.M., 1980, The Effect of Process Variables on Arc Augmented Laser Welding, SYMPOSIUM OPTIKA' 80, Nov. 1980 (Budapest).