1. Hirschhorn, J. S., Introduction to Powder Metallurgy, APMI, N.Y. 1969, pp. 38–89.
2. Kawai, N., Homma, Kr. and Yukawa, T., Technical Note on Powder Forging of Iron Powder, Kobe Steel Ltd., Kobe, Japan, 1969.
3. Greenspan, J., “Some Effects of Powder Particle Size on the Physical Behavior of Press-Forged Beryllium”, Army Materials and Mechanics Research Center Report, AMMRC TR68-08, May 1968.
4. Joyce, J. F., DMIC Review of Recent Developments? Powder Metallurgy, (citing preliminary information from TRW Inc., on U.S. Air Force Contract AF33 (615)-5411), Nov. 1, 1968.
5. Olofson, C. T., Byrer, T. G. and Boulger, F. W., DMIC Review of Recent Developments—Metalworking, (citing preliminary information from TRW Inc., on U.S. Air Force Contract AF33 (516)-5411), May 29, 1969.