1. M. Yu. Bal'shin, Processing of Metal Powders [in Russian], Metallurgizdat (1948).
2. Transactions of the Conference on Heatproof Materials, No. 4 [in Russian], (1959), p. 5.
3. V. S.Ivanova and L. K. Gordienko, Strength Improvement [in Russian], Izd. ?Nauka,? (1964).
4. M. Yu. Bal'shin, ZhTF,22, 686 (1952).
5. Yu. G. Dorofeev, Compacting of Chips [in Russian], Dnepropetrivsk (1960).