"International Symposium on Productivity and Technology in the Metallurgical Industries (1989 ; Cologne)" . . . . . . . . . "Productivity and technology in the metallurgical industries : proceedings of the International Symposium on Productivity and Technology in the Metallurgical Industries, co-sponsored by the Minerals, Metals & Materials Society and Gesellschaft Deutscher Metallhütten-und Bergleute, held in Cologne, West Germany, September 17-22, 1989" .