REFERENCES
- G. H. DeGroat, “Tooling for Metal Powder Parts”, p.94. 1958: New York and London (McGraw-Hill).
- C. G. Goetzel, “Treatise on Powder Metallurgy”, Vol. I, p. 323. 1949: New York and London (Interscience Publishers).
- B. B. Belden, Mech. Eng., 1954,76, 891.