1. H. Zhang and R.M. German: Int. J. Powder Metall., 1991, vol. 27 (3), pp. 249–54.
2. Y. Kiyota: U.S. Patent 5006164, 1991.
3. K. Hayashi and T.W. Lim: Mater. Trans. Jpn. Inst. Met., 1991, vol. 32 (4), pp. 383–88.
4. F.V. Lenel, G.S. Ansell, and J.R. Strife: in Modern Developments in Powder Metallurgy, H.H. Hausner and W.E. Smith, eds., Metal Powder Industries Federation, Princeton, NJ, 1974, vol. 6, pp. 275–92.
5. S.L. Fross: in Modern Developments in Powder Metallurgy, H.H. Hausner, ed., Plenum Press, New York, NY, 1966, vol. 2, pp. 3–11.