1. S.M. Brabyn, et al.: Proceedings of the Plansee Seminar, 1981, p.675-692.
2. W. Dawihl:Handbook of Hardmetals, p.68, HMSO (1955).
3. R. Edwards, et al.: Proceedings of the Plansee Seminar, 1953, p.232.
4. J. Whalen, and M. Humenick: “Progress in Powder Metallurgy”, p. 85–98,MPIF, 1962.
5. S. Takeda: Sci Reports, Tokohu University, Honda Anniversary Issue, p. 864, 1936.