1. N. Tschiya, O. Terada, A. Sasaki andH. Suzuki,J. Jap. Soc. Powd. Powd. Met. 37 (1990) 80.
2. L. Prakash, Report Kfk-Ext. 6/78-1 (1978) 87 (Keruforschungszentrum Karlsruhe GmbH).
3. G. S. Upadhyaya andS. K. Bhaumik,Mater. Sci. Eng. A. 105/106 (1988) 249.
4. R. Kieffer, P. Ettmayer andM. Freudhofmeier, in ?Modern Development in P/M?, Vol. 5, edited by H. H. Hausner (Plenum, New York, 1971) p. 201.
5. H. E. Exner,Int. Met. Rev. 24 (1979) 149.