1. F.V. Level, Powder Metallurgy: Principles and Applications, Metal Powder Industries Federation, Princeton, N.J. (1980).
2. R.M. German, Powder Metallurgy Science, Metal Powder Industries Federation, Princeton, N.J. (1984).
3. A. Lawley, Ann. Rev. Mater. Sci., Vol. 8, p. 49 (1978).
4. A. Lawley, Journal of Metals, Vol. 33, 1, p. 13 (1981).
5. N.J. Grant, Journal of Metals, Vol. 35, 1, p. 20 (1983).