1. M. J. Blackburn and R. A. Sprague:Metal Tech., 1977, vol. 4, pp. 388–395.
2. “Advanced Fabrication Techniques in Powder Metallurgy and Their Economic Implications” Proceeding of the 42nd Panel Meetings, AGARD, Neuilly sur Seine, 1976.
3. H. Tada, P. C. Paris, and G. R. Irwin:The Stress Analysis of Cracks Handbook, p. 2.1, Del Research Corp., Hellertown, Pennsylvania, 1973.
4. O. H. Kriege and J. M. Baris:Trans. ASTM, 1969, vol. 62, p. 195.
5. J. M. Oblak and W. A. Owczarski:Trans. TMS-AIME, 1968, vol. 242, p. 1563.