1. I.J. Spaiding and A.C. Walker, in "Optoelectronicsin Engineering", pp.667, Ed. W. Waidelich,Springer-Verlag, Berlin (1984).
2. For info. contact EUREKA Secretariat, 19H avenue des Arts, 8-1040 Brussels.
3. Improved welding penetration of a 10‐kW industrial laser