Notes
* A summary, prepared by Dr. F. G. Cox, of the discussion at a meeting of the Powder Metallurgy Joint Group on 7 December 1961, on papers by G. E. Spriggs (Powder Met., 1961, (7), 296), and J. Hinnüber, O. Rüdiger, and W. Kinna (ibid., (8), 1).